Dating websites, hookup apps, even the swinging scene. They're still all a womens' market, and there are lots of crap immitations with members only features that either cynically or via being a brand like match.com, extract cash from lonely clueless men. I find the majority of women you meet are sick of receiving approaches from men who only want a hook up and are sick of unrequested dick pics. Most are after a long term relationship, if anything just to end the dating hell!
You can have some success if you're persistent, attractive, bring your A game, and splash the cash, but it's always going to be on the woman's terms. Also the sex can be either really really good or really shit.