How do I react as a straight on gay courtship?

Hey there. First off, any gender or orientation has my unconditional support. I love and hate everyone equally.I'm a straight male dressing somewhat extraordinary, I love colors and I love patterns. Occasionally, I linger at autonomists places (usually clubs) which innately have a high ratio of gays, lesbians, transsexuals, whatever.On first sight, I may seem gay, and I'm sure there's even friends who do think I was. It frequently happens to me that males start tête-à-tête conversations to me. I enjoy conversations and love to talk to anyone as long as it runs, so I board the plane of community that get's me high.There's no need of fooling ourselves, in clubs, talking to strangers is often sexually motivated. I don't want to state it's the only case, but as chats continue there's more or less certain verbal or unverbal signs. From time to time, I'm sure or not so sure, but to date this doesn't affect my behavior in this interaction. I go on and still enjoy chatting. Should I intervene here? If so, how do I carefully state that I'm not interested without hurting anybody, and include that I'd like to keep on talking and may be looking for a new friend?Some step further, and maybe foreseeable, there's clear actions like leaning forward or touching arms, or even pushy kisses. This is the moment I back out. I decided for myself that there's no reason to excuse, it's more like a "You won't have a chance with that, but I support you in any way" With this, it seems like I point out that there is something special about it, although I don't think it is. It is just the circumstance that keeps me from going on and I want them to know that there wasn't a chance from scratch, that it's not "Yeah, you could have done better...".Is it too late? I still don't have a problem with this, but people mostly withdraw right now and I get the feeling that it's awkward for the both of us.Now I'm asking for your expertise, do you have any suggestions what I can do different? When to do this? Maybe a story about someone who did pretty well?