Using key() and count() to calculate the number of episode wich only contain guest and are female or

Suppose I want to count the number of episodes. In detail I want to get the number of episodes which only contains either woman or men as guests. I hope my question is clear and somewhat plausible.

Input:

<pc:podcast url="https://forschergeist.de/" version="0.3" xmlns:pc="https://purl.org/net/hbuschme/teaching/2019ws-infostruk/podcast/0.3" xmlns:pt="https://purl.org/net/hbuschme/teaching/2019ws-infostruk/podcast-transcript/0.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="   https://purl.org/net/hbuschme/teaching/2019ws-infostruk/podcast/0.3   podcast.xsd   https://purl.org/net/hbuschme/teaching/2019ws-infostruk/podcast-transcript/0.1   podcast-transcript.xsd">
    <pc:title>Forschergeist</pc:title>
    <pc:persons>
        <pc:person gender="male" pid="timpritlove">Tim Pritlove</pc:person>
        <pc:person gender="male" pid="michaelsonnabend">Michael Sonnabend</pc:person>
        <pc:person gender="female" pid="annettevogt">Annette Vogt</pc:person>
        <pc:person gender="male" pid="peterfinke">Peter Finke</pc:person>
        <pc:person gender="female" pid="barbaralenz">Barbara Lenz</pc:person>
        <pc:person gender="male" pid="suatyilmaz">Suat Yilmaz</pc:person>
        <pc:person gender="male" pid="onurgüntürkün">Onur Güntürkün</pc:person>
        <pc:person gender="male" pid="martinlindner">Martin Lindner</pc:person>
        <pc:person gender="male" pid="petereisenberg">Peter Eisenberg</pc:person>
        <pc:person gender="male" pid="michaelschermann">Michael Schermann</pc:person>
        <pc:person gender="male" pid="henrikmüller">Henrik Müller</pc:person>
        <pc:person gender="female" pid="antjeboetius">Antje Boetius</pc:person>
        <pc:person gender="male" pid="gunterdueck">Gunter Dueck</pc:person>
        <pc:person gender="male" pid="ferdischüth">Ferdi Schüth</pc:person>
        <pc:person gender="female" pid="claudiaeggert">Claudia Eggert</pc:person>
        <pc:person gender="female" pid="dagmarschäfer">Dagmar Schäfer</pc:person>
        <pc:person gender="female" pid="murielhelbig">Muriel Helbig</pc:person>
        <pc:person gender="male" pid="nikolauskriegeskorte">Nikolaus Kriegeskorte</pc:person>
        <pc:person gender="female" pid="ulinkarublak">Ulinka Rublack</pc:person>
        <pc:person gender="male" pid="michaelbraungart">Michael Braungart</pc:person>
        <pc:person gender="male" pid="pascalhetze">Pascal Hetze</pc:person>
        <pc:person gender="female" pid="lindabreitlauch">Linda Breitlauch</pc:person>
        <pc:person gender="male" pid="jürgenhandke">Jürgen Handke</pc:person>
        <pc:person gender="male" pid="franzjosefradermacher">Franz Josef Radermacher</pc:person>
        <pc:person gender="male" pid="klauskümmerer">Klaus Kümmerer</pc:person>
        <pc:person gender="male" pid="uweschneidewind">Uwe Schneidewind</pc:person>
        <pc:person gender="male" pid="eberhardknobloch">Eberhard Knobloch</pc:person>
        <pc:person gender="male" pid="ulrichdirnagl">Ulrich Dirnagl</pc:person>
        <pc:person gender="male" pid="hansjoosten">Hans Joosten</pc:person>
        <pc:person gender="female" pid="angelikabrandt">Angelika Brandt</pc:person>
        <pc:person gender="male" pid="andreaszick">Andreas Zick</pc:person>
        <pc:person gender="male" pid="güntherziegler">Günther Ziegler</pc:person>
        <pc:person gender="male" pid="michaelvogel">Michael Vogel</pc:person>
        <pc:person gender="female" pid="siljagraupe">Silja Graupe</pc:person>
        <pc:person gender="male" pid="ernstpeterfischer">Ernst Peter Fischer</pc:person>
        <pc:person gender="female" pid="juliaoffe">Julia Offe</pc:person>
        <pc:person gender="male" pid="pavelrichter">Pavel Richter</pc:person>
        <pc:person gender="male" pid="benjaminlahusen">Benjamin Lahusen</pc:person>
        <pc:person gender="male" pid="reinholdleinfelder">Reinhold Leinfelder</pc:person>
        <pc:person gender="female" pid="claudiahornberg">Claudia Hornberg</pc:person>
        <pc:person gender="female" pid="monikatrümper">Monika Trümper</pc:person>
        <pc:person gender="male" pid="jörnloviscach">Jörn Loviscach</pc:person>
        <pc:person gender="female" pid="lisarosa">Lisa Rosa</pc:person>
        <pc:person gender="male" pid="ralfstockmann">Ralf Stockmann</pc:person>
        <pc:person gender="female" pid="lyndalroper">Lyndal Roper</pc:person>
        <pc:person gender="male" pid="jürgentautz">Jürgen Tautz</pc:person>
        <pc:person gender="male" pid="stefankröpelin">Stefan Kröpelin</pc:person>
        <pc:person gender="male" pid="christophcorves">Christoph Corves</pc:person>
        <pc:person gender="male" pid="jöranmuußmerholz">Jöran Muußmerholz</pc:person>
        <pc:person gender="male" pid="hannshatt">Hanns Hatt</pc:person>
        <pc:person gender="female" pid="carolinbock">Carolin Bock</pc:person>
        <pc:person gender="female" pid="andreaniehaus">Andrea Niehaus</pc:person>
        <pc:person gender="male" pid="volkerquaschning">Volker Quaschning</pc:person>
        <pc:person gender="male" pid="jochenrabe">Jochen Rabe</pc:person>
        <pc:person gender="male" pid="haraldlesch">Harald Lesch</pc:person>
        <pc:person gender="male" pid="sebastiankuhn">Sebastian Kuhn</pc:person>
        <pc:person gender="male" pid="manfredniekisch">Manfred Niekisch</pc:person>
        <pc:person gender="male" pid="christopherzimmermann">Christopher Zimmermann</pc:person>
        <pc:person gender="male" pid="philippewampfler">Philippe Wampfler</pc:person>
        <pc:person gender="male" pid="stefanrahmstorf">Stefan Rahmstorf</pc:person>
        <pc:person gender="female" pid="julespecht">Jule Specht</pc:person>
        <pc:person gender="female" pid="isabelrink">Isabel Rink</pc:person>
        <pc:person gender="male" pid="ingosass">Ingo Sass</pc:person>
        <pc:person gender="male" pid="robertranisch">Robert Ranisch</pc:person>
        <pc:person gender="female" pid="anitagohdes">Anita Gohdes</pc:person>
        <pc:person gender="male" pid="gerdgigerenzer">Gerd Gigerenzer</pc:person>
        <pc:person gender="female" pid="alinakokoschka">Alina Kokoschka</pc:person>
        <pc:person gender="male" pid="oliverparodi">Oliver Parodi</pc:person>
        <pc:person gender="male" pid="justushaukap">Justus Haukap</pc:person>
        <pc:person gender="male" pid="peterpurgathofer">Peter Purgathofer</pc:person>
    </pc:persons>
<pc:episode date="2019-10-01T11:00:00" duration="01:53:23" episode="72" title="Verantwortung in der Informatik" url="https://forschergeist.de/podcast/fg072-verantwortung-in-der-informatik/">
        <pc:contributor pid="timpritlove" role="host"/>
        <pc:contributor pid="peterpurgathofer" role="guest"/>

</pc:episode>

<pc:episode date="2019-09-05T14:48:00" duration="02:29:05" episode="71" title="Wirtschaft und Wettbewerb" url="https://forschergeist.de/podcast/fg071-wirtschaft-und-wettbewerb/">
    <pc:contributor pid="timpritlove" role="host"/>
    <pc:contributor pid="justushaucap" role="guest"/>
</pc:episode>
<pc:episode date="2019-07-29T11:00:00" duration="01:28:03" episode="70" title="Nachhaltigkeit und die Stadt" url="https://forschergeist.de/podcast/fg070-nachhaltigkeit-und-die-stadt/">
        <pc:contributor pid="timpritlove" role="host"/>
        <pc:contributor pid="oliverparodi" role="guest"/>



</pc:episode>



<pc:episode date="2020-01-01T00:00:00" duration="0" episode="043" title="Schule und Lernen in der digitalen Welt" url="https://forschergeist.de/podcast/fg043-schule-und-lernen-in-der-digitalen-welt/">
        <pc:contributor pid="timpritlove" role="host"/>
        <pc:contributor pid="lisarosa" role="guest"/>
</pc:epsiode>

My xsl:

<?xml version="1.0"?>

    <xsl:stylesheet version="1.0" 
        xmlns:pc="https://purl.org/net/hbuschme/teaching/2019ws-infostruk/podcast/0.3" 
        xmlns:pt="https://purl.org/net/hbuschme/teaching/2019ws-infostruk/podcast-transcript/0.1" 
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
        <xsl:output method="xhtml"/>



        <xsl:key name="person-name" match="pc:person" use="@pid"/>
        <xsl:key name="geschlecht" match="pc:person" use="@gender"/>
        <xsl:template match="pc:podcast">
            <html>
                <body>
                    <h1>Episoden, in welchen der Guest Männlich ode weiblich war.<i><xsl:value-of select="pc:title"/></i></h1>
                    <ul>
                        <xsl:apply-templates select="pc:episode" />
                    </ul>
                </body>
            </html>
        </xsl:template>

        <xsl:template match="pc:episode">
            <li>
                <xsl:value-of select="@episode" />: <xsl:value-of select="@title" />
                <ul>
                    <xsl:apply-templates select="pc:contributor" />
                </ul>
            </li>
        </xsl:template>

        <xsl:template match="pc:contributor">

                <xsl:for-each select="key('person-name', @pid,)">
                    <li>
                    <xsl:value-of select="."/>
                </li>
                </xsl:for-each>
                <!-- <xsl:value-of select="key('person-name', @pid)"/>   -->
        </xsl:template>




    </xsl:stylesheet>

Desired Output:

4 episode where guest is male
1 Episode where guest is female 

How can i use properly the key() and count() function? Thanks in advance for answering my questions.