And that is exactly how it should be with reference to once you are gone, that is it, the end (well until the next time), but... some clients see the same lady for years and some have reg ladies they have been seeing longer than the relationships they have had in their lives, some guys don't have relationships at all and some really enjoy the closeness of being with a woman, some prefer that than the act of sex.
I've heard many a time with clients that are divorced, that the thing they miss themost from their relationship is the cuddles and I can well relate with that having chosen to be single while working, so once again it comes down to us all being different and wanting different things and as you say, that actually differs from booking to booking with some clients, as one lady might just get you red hot for a good (coughs) and another might bring out the more romantic side in you.
We are complicated creatures and in this case there is no right or wrong, it just feels different for all and dependent on which hormones are released and what life has thrown at you at that point in your life.