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1.
The state of attractiveness that is best attained when dressed for success (or for work).

Professional + sexy
(At bar during happy hour)
Man: Damn girl, you must be coming from work, looking all prosexional. Can I buy you a drink?
Woman: Hehe, okay!
by Poshow May 10, 2007
 
2.
To be very proficient and highly skilled at sexual intercourse.
"Oh my, Stacy. Jim rocked my world in bed last night! He is a real prosexional in the way he handles me."
by DLo15 March 19, 2013