Questions: Food & Beverage

My boyfriends 21st bday is this month and he's been talking about drinking forever. I mean he's drank before but he's tryna go all out since he’ll be legal now. He claims he won't get drunk and that he's never been drunk. Im not tryna be a party pooper so im like ok have fun ig. I can't go since we’re ldr. But im worried deep down because he's talking about having like a couple of drinks but that he shouldn't get drunk since 2 cups never effected him. I dont drink but i do worry about him drinking while im not around. he's never drank outside of home before and I don't know what to expect since he’ll be hanging with an old HS friend. He said they’ll prob have 2 drinks at a restaurant and then go to a liquor store after. Since i want kids in the next year or so should i be worried about his fertility since he claims he’s gonna buy a 6 pack of whatever and drink them on different days? Like is he on the path to becoming a drunk/less fertile? #AlcoholicsMixtape #FeelFreeToList