I am a 50 yr old gay man thinking back to some of the 18 yr old Gay Guys I've known and their dating experiences. Relationships at any age are hard I find it hard to believe a 18 yr old guy hasn't dated or hasn't had sex with other guys by that age. So worrying about his innocents might be way to late and a lot of younger guys were mean to each other terribly mean. So finding a guy who cares might have been what matters the most to him now. There aren't any easy answers you parents need to figure out his life experience by talking with him. One last shocker how long has he been dating this man ? Good Luck, jeff a realist