Can babies even donate kidneys? Aside from the ethical issues around informed consent (this is Billions, so obviously ethics do not apply), would a baby kidney be "strong" enough for an adult?
Is it so weird given who is in power in Hollywood and who is in writers rooms?
As for Chuck, he arguably has money and power, both of which some women find attractive. So in general an argument can be made for him getting some women that seem out of his league, but the show hasn't demonstrated that those are the women he is getting. I can't remember if Wendy already had money when they met, but she doesn't seem like a gold digger, so maybe she was attracted to his ambition and/or power? I know we were shown a flashback for Wendy and Chuck, but i care so little about them I can't remember shit. With the new professor she might be intrigued by his openness about his kink, not realizing that it was a last ditch effort to stop some calamity.