I don't allow more than once for various reasons -
For the majority of guys getting an erection so soon afterwards is already difficult, not to mention actually Cumming. This therefore puts the MG or WG under pressure which then also puts the guy under pressure. This whole scenario gets uncomfortable for both parties which will effect the outcome of the booking. Leaves the girl irritated and exhausted and leaves the punter feeling rushed...
Thats why I always give clients two options when booking. Half an hour which includes oral, foreplay and full house or an hour which includes full body massage, oral, foreplay and full house.

@Lili: What you say makes sense.

My own experience and talking for myself only. Up to my early 40's i easily came twice in an hour.

Now closer to 50, and becoming more used to punting and beautiful nude girls, i can rarely come twice in a session. If i find a girl incredibly sexy, and it also feels like she enjoys me (ieven if she is acting, but doing it well), ican still come twice. I have no problem getting a 2nd erection, but coming again often is tough. BUT i tell the girl upfront, you are welcome to try - i like the "exercise" , but most probably i will not come. I feel that takes the pressure off both of us.

ALSO, if i get a feeling a girl is really not into me, or rushing, i can struggle to even come the first time. Happened to me a couple of times in 10+ years....

I allow guys to come as many times as they can. I an hour they pay for an hour they get an hour.

My record is 4 times.

It is totally up to the client..

Guys please let me know , when you do decide to come visit me; that you want multiple orgasms or you will get the standard service: massage and HR with or without prostate massage.

Always try to communicate your expectations before the session starts.