Just discovered this thread.
I'm a creepy single guy who goes to M4 from time to time. I'm not going to pretend that me being a man and walking around in a towel watching other people have sex isn't creepy, and I'm not Brad Pitt so not even that will save me. I'm at peace with it, mostly.
All that being said, I just want to call out that you can absolutely be a single guy at a sex club and get laid. I think M4 or maybe X Club (never been) or any other club that regularly allows single guys is going to give you a better chance because, without speaking too generally, the women who frequent those clubs are expecting the single guys and are at least used to them hanging around. Oasis has, I think, only one single guys night a week, whereas with M4 it's the other way around. While I've never been to Oasis, I'm assuming that the crowd there might not be as receptive to single guys' night, though I'm certainly open to being corrected there.
The women at M4 are very good at making sure that guys they're not interested in keep their distance and anyone I've ever seen try to cop a feel without permission gets shouted at loudly and they scamper. 99% of the time I see guys keeping a respectful distance - though the definition of "respectful" when watching people have sex with your dick out is debatable. I know I'm probably missing the bad actions of many, I'm not there often, but just from my personal experience.
I've seen and personally experienced a couple things working for single guys including myself. One is - dress nicely (slacks and a button up with supporting accessories), sit at the bar, and talk to people. Talk to the bar tender, talk to people who sit beside you, whatever. I HATE talking to strangers but I make myself do it. Not only does it make you possible connections, but it also just shows to everyone seeing you that you're a friendly, well dressed guy and not some rando walking around waiting to get invited in. Last time I was there, a petite older woman squeezed up next to me at the bar to order a drink. As she was walking away with her drink we cracked a few jokes together, she very-unsubtley looked me up and down and said "see you in there?" (referring to the play area) and it was on. Easy peasy. She was looking for a single guy and because I talked to her, that got me through the door (I'm sure physical attraction is in there too but it rarely means shit if you don't connect).
Second, I've watched MFs just ask. Can I join you? The woman or couple says yes, and they're in. With many things in life, sometimes you get a lot further in your ambitions if you just ask. Asking a woman at the club outright for sex is not something I've been able to make myself comfortable with but I should really give it a try. I was fucking a woman once and a handsome dude came up, asked if he could join, and all of a sudden I was one leg of an eiffel tower. Fine with me.
Third, at least to my experience at M4, there are women from time to time who want to have a train run on them or want to have randos cum on their face or whatever. Sometimes you've just got to be in the right place at the right time to get a little action. There's a Sunday every quarter called "Ladies Choice Gang Bang" where 4-5 women talk to the single guys for the first hour and if they like them they give them bracelets that act as permission to participate in their gang bang. I haven't had the good fortune to be able to attend yet but once the club re-opens I'll be there first event.
Lastly, and honestly I'm just trying to be informative here - it can sometimes help to have a big dick. Some of the women there are looking for it. Last time I was there, I fully struck out all day. Was about to go finish at the glory hole and head home when I spotted a gorgeous woman getting double teamed in the casual area and guys around watching, hoping to get asked to join. I mingled into the viewing group as one of the creepy guys, my towel abandoned. The woman's husband, who was gate keeping, spotted me and said "there's the big dick we need, come here," and next thing I knew I was getting blown and then she asks me to fuck her. An event before that a woman called me from across the room and said that my big dick deserved better than the nothing it was getting and then showed me what she meant. I mean, sometimes girls do like big dicks I guess. This is probably also the same for the Brad Pitt types. I see a lot of dudes with a lot more muscles than me getting laid at M4 and I don't necessarily think they came with dates either.
Anyway, I hope this was helpful to the single men out there. The last point aside which is god given (or gods cursed sometimes, but that's a different topic), you can in fact get laid at a sex club if you're a single guy. Accept that you're a creep and do everything you can to minimize it. Good luck!