I wasn't sure to post here or /adv/. but since its gay/bi

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I wasn't sure to post here or /adv/. but since its gay/bi related I want to post here.
I have a friend I've known for about 5 years, we're close and hang out and our girlfriends like/know each other.
Long story short, the last 3 times we hung out together and drank we did some sexual stuff, blowjobs, handjobs, etc. He says the next day things like "man I don't remember anything after" which so happens to be around the time we started fooling around.
The first time I thought it was a fluke, then we did it two more times. He keeps saying that he doesn't remember anything from the night before and he doesn't treat me any differently. So I guess my question is, can someone really give handjobs, blowjobs, etc. do it multiple times over the course of a few months and honestly not remember it?