[ Lesbian, Gay, Bisexual, and Transgendered ] Open Question : I just walked in with my 15 year old son having sex with a male friend.?

i was putting the dark wash so i want around the house looking for dirty stuff to put on and i walked into my son's room ( Dean's ) what is a 2 part bed room, so i walked in the room and i heard this wet sicking noise. so i popped my head around the corner of the room and cameron was laying down on the bed while ( Sam ) his friend was sitting on his chest with his willy in his mouth and Cameron was sucking on it, And after that i walked away and i was like OMG and now i don't know what i should say to him because he all ways ses that he has a gf and that he i straight. and i was going to have the honey and the bee talk with him but now i think he is gay i dont know what to tell him, how to have safe sex.. can someone explain what i should tell him.