Before I met my husband I used to do alot of anon sex at bathhouses, and I found it quite easy for gangbangs to happen.
The thing I found with it was the longer I got fucked the easier it was for me to keep going because I would get into a headspace that would take over and would allow me to take any and all dicks that wanted it there.
Now that I no longer do anon scenes I find it allot harder to get a bunch of men together that are only tops to show up all on the same day for a gang bang, and even if I do it's only 4-6 men not the 10+ I would get in bathhoues or bookstores. So if you are ok with anon strangers I highly suggest this method for getting your ass bred by a bunch of men. Though remember you may have a good night with 10+ men or bad one with 0-1 and not to get too disappointed on bad or avrage nights.