From a respected Registered Massage Therapist in San Diego:
Young females (25 or so) tend to be the most obnoxious of clients. This isn’t a sexual thing, far from it, but some characteristics I have found is:
A lot of my clients prefer to be un-draped (nude) during a massage, but this is normally something that will come about after a session or two with a polite request. Young Females tend to be used to getting their gear off for their brazilian wax, and think nothing of stripping off on the first visit. This puts me in an awkward position, as we have no relationship.
They never stop talking. Either about themselves, or their friend/s or imaginary Facebook friends who think they’re awesome.
Usually are fitness fanatics, who are quite proud of their bodies
**** And, they have never properly learned how to wipe their bottoms. Seriously, this part defines ‘gross’

****
My preferred client base is in their late 30’s ++++++