Being fucked is highly erotic and feels amazing. It's possible, if they do it right, to actually orgasm just from being fucked but that's rare. Unfortunately, although you'll know they've cum, you don't actually feel it inside - it's all the same body temperature and (famously) only about 10cc...
That's about the only unfulfilled fantasy I have - done just about everything else. I agree on the 'take your time' but I must say; I've never been blackmailed or felt I was at risk of being, never had any cleanliness issues, never caught anything (even in saunas). I am careful with who I meet...
I was stuck in traffic on the M4, behind a car that was driving a bit erratically. Odd, I thought, considering we were only crawling along. Then a woman came up from the driver's lap and it suddenly all made sense. :p
I will say, on the one occasion it happened to me, I kept the car straight!
Do they even, truly, exist? I've known a few highly sexed women but I wouldn't class them as nymphomaniacs. Certainly not as sex obsessed as guys can be!
If there are any, I'd also love to know :p
Patience .. it takes a lot of time (and effort) to find a genuine couple & you have to be willing to go outside 'local'. I had a couple I used to visit regularly in Kent (I'm Oxford). That was before lockdown knocked it on the head. I remain ever hopeful tho.