Whiskey is no doubt one of the manliest drinks. It's what you imagine cowboys to have drank in the old west. In fact, I think that's all they drank since the water was filled with parasites. There's nothing manlier than some whiskey on ice, but that's not the only way to drink whiskey. There are tons of tasty cocktails you can make with it in case you have a lady friend, or a feminine male friend, who want some whiskey.
Mixing good drinks is a great skill to have. If you go to house parties, you'll often see that there are people who are very confident in their drink-making abilities. It's a fifty fifty shot whether they're actually good or not. Confidence doesn't always mean guaranteed success. In fact, it often means the person sucks.