Well, firstly define from what perspective the sex denial would take place from.
Never really thought about this. But, perhaps establishing some form of an emotional connection as to why the Male PC denies the sex? I know there are people out there who define themselves as "asexual" - meaning a lack of sexual attraction to others and/or low interest in sexual activity (
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So, making a game revolving around a male MC and his asexuality might be an interesting take now that I think about it