If homosexuality were preventable should it be prevented?

[Question Mark]

Please tell me what is the difference between the roles of a mother and a father if there is one? Does the male have to take on the "father figure" role? Does the female have to take on the "mother figure" role?

I thought it was well known that a child ideally only needs at least one stable loving carer in their life.

I've heard that girls without fathers become more promiscuous in later life, but I'm skeptical when i hear stuff like that.

Sounds like folk lore to me.