In general, I would say yes there is a market but it is tiny and not lucrative enough to make a living from.
My boyfriend is a very fit, active middle aged man who scrubs up well and has had 3 bookings from women in almost 2 years.
1 was a dinner date, the other two were purely sexual. If you're good looking, witty, charismatic, able to hold a conversation, flirt and make a woman feel good about herself without being skeevy, and if you have skills in the bedroom (massage, fingers, mouth, toys, maybe some kink etc) then you might make some money.
The market is saturated however, so your presentation and marketing would have to be on point. We're talking high quality pics that cater to the female gaze, an advert that shows confidence and charisma, an enticing price point, and ofc the skills behind closed doors to make it worthwhile.
As others have said, it's very easy for a woman to get NSA sex but (speaking from experience) it's very difficult to have have the kind of sex/date that they want. Between worries about safety, catfishing, or their date just not providing a satisfying time it can be frustrating out there. So if you have the skills and the aptitude for this line of work and can get that across in an advert then you might find you get a few bookings from it.