In one go? No, no and no. Spreading your units out (1 or 2 a day) is fine. In fact a small amount of alcohol a day is good for you. My granddad is 87 and he has a tipple every day.
My school had this big movie to show us about sport performance and alcohol. It said that even a little alcohol can affect your athletic ability..however, less alcohol affects less, and vice vera. Long story short, yes..it affects you..even just a little bit.