Anonymous wrote:(Much) older lesbian here. They will almost certainly fool around if left alone, but they would do that any chance they got anywhere they could find some privacy.
Yes STDs are a concern, and you need to talk to your DD about how to prevent them.
But I think the far greater risk is the same as with any hetero 15 year old in her first relationship -- the potential emotional impact. Lesbian relationships can be very intense, because they often combine both romantic love and a best friendship.
If (when) things go south, she will probably have a very hard time. I know I did. The sex was the least of it.
I agree with this poster. My DD has her first GF and they are very intensely involved. It does seem to be a "best friend" kind of relationship more than a romantic one. My DD doesn't have many friends and her GF is her entire social life... I keep trying to encourage making friends beyond the GF as the GF will be going to college a year before my DD does and I think she won't have anyone.