Another thing I've noticed is many inexperienced and virgin men will put their knees up, they don't realise their legs need to be flat for cowgirl. I suspect this is partly self-protection. I gently coax them down, but as above I find there is a lot of variation not everyone is the same or a handful and I enjoy providing a nice first time for them.
In my teens a couple of boys I knew from school asked me to break their virginity, we went to an 18th party then went to one of the boys really nice parental home. His parents were away so the coast clear, the boy I had sex with just took to it really easy, the other discovered he really is gay.
Occasionally my path has crossed with the first one, we just smile knowingly.
I guess some of my patience may come from these experiences however my virginity was not as smooth - probably another reason I'm able to show care and do like the bookings.
However I won't put up with the 'I'm a virgin so clean' I do a bit of sexual health education, explain I keep myself and everyone I have sex with safe by applying the same rules and encouraging them to take responsibility for their own sexual health. Disability clients have often been well shielded from this sort of thing.