Yes, different effect on different people and at different times. Carry on.
I was a binge drinker for several years...18-25 and never had any issue with my sexual performance while drunk. The info you give does not apply to all and cuddling is not going to change someones drinking.
Visit www.cuddleuptome.com. It is Samantha's website. She is a professional cuddler. She has written a book as well on cuddling.You can help him by cuddling him to reduce his alcohol intake.
When one enjoys a healthy sex, they do not need more number of intercourse.With alcohol, your performance enjoyment level is poor. With this drinking and sexual activity, his performance will deteriorate very fast. He should control his drinking and sexual activity so that he can perform for a very long time.Try to improve the quality of intercourse, having full body orgasm simultaneously. Google 'Breath and Orgasm" learn 3 types of breathing. One is alternate breathing, second is Simultaneios breathing and third is circular breathing. This will serve as a good fore play.
I could get hard and stay hard for hours and not ejaculate. Different effects on different people.
The probably I see is how much he drinks. I used to be in that situation and it does not go down a good road. I would encourage you to talk to him about cutting back.
How often does he drink?