My hubby and I have been trying for years to talk my son out of having threesome sex with his girlfriend's son's gf. To be clear, we're not asking for him to stop being a gay parent (he is), but we do want him to be more aware of what he's getting into. This is especially important considering the age difference between his daughter and his son, as well as the fact that his girlfriend's son is only about 6 months older than him. It can be extremely dangerous for him, and we don't feel he is ready to deal with that yet. He also has said that he likes to watch porn, so this poses another set of problems for us.