Easy. If they are regular and liked they don't usually push boundaries hence being regular and liked.
Obviously things become a little relaxed there isn't that nervous feeling before they come and you know what to expect.
in regards to condoms for sex etc that will never ever be crossed and if attempted or asked it's goodbye, also when the 'i love you' or 'i have fallen for you' happens because that's not why I'm here or what I'm looking for so I don't want to lead anyone on.
Some clients have become friends which means I don't see them as clients anymore & as much as it sucks financially friendship is a nice thing to have.
But mainly like I said at the beginning if they are nice and regular they don't attempt to push boundaries in the first place.
If a lady does not offer a service. There are plenty of ladies that will do it as an extra. Clients want the porn experience and lots of ladies offer it to gain more business.