Hmmm. A good question to ask that might help you to find a bar or club where you feel more comfortable and less offended would be:
Is the "culture" of the type of club or bar (as defined by the management and embraced by the majority of patrons) such that it is normal to immediately ask for sex or intimate contact with anonymous persons?
If not, then the patrons who are accosting you are "out of line" and should be brought to the attention of management for redress.
If so, then perhaps your choice of bar is not in keeping with the environment that you prefer. In other words, you're in a place where your expectations are at odds with the culture and environment that management and majority of patrons prefer. Perhaps going to another bar is the best solution.
Clubs and bars are semi-public places. And, when you add alcohol and possibly other substances into the social mix, people are going to be more forward and less inhibited than in other places. People are going to do and say things that are unusual and possibly downright offensive. That is part of the dynamic of a bar that serves alcohol or where substance use is prevalent.
There are alternative clubs and venues that do not serve alcohol, where substance use of any kind is frowned upon, and where the focus is more on social interaction. Perhaps one of these options might be more in keeping with what you might be seeking.
I seldom go to bars anymore because I just don't want to be around the drama that generally occurs in bars. Also, I'm not looking to meet other guys who hang around bars all the time. I just don't see this as a lifestyle characteristic that fits well with my own lifestyle.
I'm sure you'll find a place that you feel at home spending time and meeting people. Keep searching.
Aloha and Be Well!