“He knows he has an unusual penis,” Daniels writes. “It has a huge mushroom head. Like a toadstool…”

"I lay there, annoyed that I was getting fucked by a guy with Yeti pubes and a dick like the mushroom character in Mario Kart…

“It may have been the least impressive sex I’d ever had, but clearly, he didn’t share that opinion.”

I believe it’s a reference to when his penis was famously described as looking like the little mushroom people from Mario games.