The only 2 sites I've found which are free and legit are saucydates.com and fabswingers.com.
I have met ladies from both sites.

scamanalyse says about saucydates
quote ......

Saucydates.com has Unsatisfactory Reputation
May not be Safe to Use
Updated Mar 8 2017

tinder is probably ok if your a teenager or early 20s age group.

I signed up to four dating sites, only paid money on one, apparently they were totally unconnected, but guess what? The same bunch of women were on every single site! One woman had multiple profiles under different names on each site but exactly the same picture. Obviously all these sites were just total scams so I cut and ran.
Sites were:-
XXXAdult date
Local Shags
Saucy over 60s and another I can't remember the name of.

only use free sites on the off chance there maybe some real women on there ,but start with the premise theyer all crooked rackets .never give over your CC details as you cant get rid of them until they have hammered your cards for as much as they can...

I would say that there are some Adult websites that are not TOTALLY scams. I have had some success with Alt.com, Adultfriendfinder, and adultmatchmaker, and RSVP. I had some success with Collarme when it existed. I got to know many real life local women who were listed on these sites. There are a plethora of sites around at the moment who seem to contain women who are too good to be true, and you know what they say about anything that is "Too good to be true!". I would advise extreme caution with any "new" sites that appear and claim a large database of hot horny women. I am being bombarded by these on an almost daily basis. Sadly they are almost always TOO GOOD TO BE TRUE!

it also depends on where you live and the numbers of free women in your local area .if you live in a big city like NY ,you have more chances .but in a small town the site will make up false profiles for you to get your card details.and then you know it cant be true ,as its not normal

Honestly I have met great women on Tinder

Well I've never personally tried a adult dating website. But Tinder is mainly for hookups so in my opinion the hookup websites could work or at least you may find some real women on some. I believe they will in the futurte if not now. Or at least there should be but people are to chicken or somehting.

I came across this forum because I had the same question...I've tried many sites...I will tell you this...AFF and ALT do have some real women...but I would say "most" are fake...after awhile you learn how to spot a lot of the fake ones. I've been using AFF on and off for 10 years...I've probably sent well over 1000 emails...and have actually hooked up with maybe 10-15 women in that time frame. It's a horrible ratio. There are probably 100 hard up men and 200 fake women for every 1 legitimate woman. The real women get inundated with emails so your email is 1 of 100's they get on a daily basis...so you have to put some thought into your emails. If the woman looks like a supermodel...don't be an idiot and think she's real. Take the time to read profiles...if you have half a brain, simply reading the profile can clue you in. Don't just email women with pictures...if it's casual discreet cheating sex you're looking for...with a woman wanting the same...chances are they won't have a picture...again...half a brain people. Create an email address that you don't care if it gets spammed like crazy because it will.