Did my boyfriend lie to me about marijuana and the affects?

I’m posting this again because Fluther wanted me to re-word it and didn’t want me to discuss illegal activity.

So, long way before my bf and I dated we were just friends. He told me about the time he lost his virginity when he was really high to a girl he didn’t like and even fell asleep during sex.
That was like 6–7 years ago. Now that I’m thinking about it, everyone tells me that marijuana does not impair your judgement in that way (sexually) and does not lower your inhibition. Now I’m thinking he’s lying to me for all these years and blaming everything he did on weed. He doesn’t smoke anymore…but someone tell me if he’s just being stupid and blaming it on the weed and most likely lying.