Some sites are total scams, but others are quite real. However, even on the real ones, not everyone there is "real".
Some will be scammers, some will be pay-for-play professionals who bait and switch you. So do take precautions and have some healthy skepticism.
But yes, it is a genuine reality that you can just meet a stranger, skip all the dating shit, and just have a hot fuck.
Honestly...as human beings get older a lot of us just get hornier and less willing to bother with all the time and energy and heartbreak of dating. It's nice to just share moments of pleasure without all the extra expectations. So get out there, live a little, and have fun!
Be careful and trust your gut.
Meet first in a public place, for a vibe check. Agree in advance that you'll move to a private space if you're both feeling it.
Have an emergency contact on speed dial. Don't leave your drink unattended. Basically, all the typical first-date safety stuff that women do as a matter of course, you need to do.
You can literally just read dating safety advice for 20-something women and apply it to yourself.