If a character is currently a very mobile fungus, what health concerns about sex would be reasonable? I'm thinking fungal infections, pregnancy … maybe something about tissue strength and tearing?

Fungus character is a trans man in the shape of a be-vagina-ed human, partner is mostly-human cis man.

(Yes, I am asking for my AU Shen Qingqiu. #SVSSS #BingQiu #FanFicAU #TransShenYuan )
#nsfw #nsfe