How dare you! The onus does not fall solely on the female. Men need to be responsible for their actions. If a female says "no" or cannot give consent, that should be the end of it. Even if a female says "no" after initiation, it then becomes non-consensual. By implying that a female drinking with a male is the open invitation for sex is reprehensible.  It has as much logic as the clothing a woman chooses invites sex. Men need to learn to keep their pants zipped up and not assume everything is a sexual invitation. 

Do you only buy drinks for ladies because you want to be more than "just friends"? Remember, this also includes drinks bought for co-workers, friends, and family members. Cause I know for a fact that not all women want to sleep with every guy they buy a drink for, or accept a drink from.
If your daughter got caught in this situation (God forbid!), would you accept this as an argument for consent?