Can't be the only guy thinking - I see you charge $250 an hour, as long as you're doing that and counting the minutes of our encounter I'm worried about my nut, not yours. Your bf isn't worried about 60 minutes running out and he has to be good for you to want to continue to have sex with him; customers just have to be clean, nice, and have money for you to see them again. I see the hooker/John relationship for what it is, I'm not going to be falling in love with you wanting you to love me back and impress you with my fantastic sexual skills (even if I wanted that wouldn't happen but that's a different topic).
The communication comments are very true too, especially if you don't know your partner very well.
Finally, girls have said here they just want the guy to nut and be done with the appointment and there's so much talk of girls that fake enjoying sessions that I'm not going to keep going for fear you're really thinking you want me to hurry up and finish.