This really depends on what one considers to be "affecting"
I only drink on occasions which is about once a month or once in 6 weeks. Even then, I don't get wasted off my head. Just 4 - 5 beers. Enough to feel a slight buzz.
I don't drink regularly because alcohol does cause dehydration, lowers testosterone and slows down metabolism if consumed frequently. As an athlete, this is exactly the opposite of what i want.