Hey Anto, i'm sure you have seen a lady that catches your eye and you like, when you decide to call take a breath and just be polite. No harm in mentioning it's a new experience that your looking forward to trying, don't worry your not their first and it's a turn on for most if you've read here on some of the threads. :-)
Best to book an hour if possible and it won't hurt to be fresh and prepared you know....;-)
PS if for some reason you can't make the apt be no harm to send a text or call to let them know. You don't wanna be that guy bro......
Best of luck!