I think they meant they didn't know anal sex since Lodi said "it'll hurt" and you can see some hetero couples go at it everywhere (and you can see some babies around too) there's hetero couples and there's gay couples that didn't know how anal sex exist lol.
Don't try to put any logic to Yaoi hahaha
You know, I feel pretty stupid for not stopping to think about that.
Yeah, steph is right. All of the males assumed that two men couldn't have sex like straight couples do. No one thought about using the back door because it seemed impossible.
Okay author, but if they didn't know about penetration how did they reproduce?