How could it not be child-friendly? It certainly does not harm children. I have read such things since I was 12 - where is the harm there? Moreover, it is important to note that not only is it not harmful, but it is actually a universally good thing to understand such things. Whereas arachnophobia does not tell of reality well, sexuality of fiction tells of an essential thing in reality.

There may be some things that are "harmful" to minors, but it is very important to note that reading about sexuality is not among them. It is actually beneficial.

The importance of this in noting that one never needed to abstain from mentioning arachnophobia in public. Just talking about it could not possibly harm minors. So why should there be a standard that sexuality in fiction never be spoken of? If indeed there is no shame, then it should be talked about in an open space. And if indeed, reading and writing about sexuality in fiction is something constructive rather than destructive (like Arachnophobia), then why should one concede otherwise? I note that not only is sexuality in fiction is okay for there to be, but it actually is GOOD for it to be there, where Arachnophobia has no such redeeming value.