I have to say I'm glad that DH and I don't really drink, so we don't have to worry about this! He does like a shot of whiskey now and again, but he maybe has that like every other month at the most?
I will say, that if I did drink socially, I probably wouldn't during the TWW. I studied fetal alcohol syndrome in college (this isn't where you're addicted or anything, just where the alcohol interferes with their brain developement and stuff), and I just don't think I could forgive myself if my drinking caused something like that. That being said, there are other things that I don't put on hold/give up during the TWW, but they usually have a lesser risk of harming something.
Also, like another poster said, it affects DH's sperm too. From what I studied, it'll affect it for the next 72 hrs, so DH def. can't drink around my fertile time, and even if it's not my fertile time I usually make him wait at least 48 hrs for any action. It can make his swimmers abnormal, and I don't want to increase the risk of deformed swimmers getting anywhere near my eggs!