Both women and men clients come to me for therapeutic services, not sexual. Clients undress (while I'm out of the room) and lie on a massage table under a sheet.
Why undressed? So I can access and manipulate muscle groups - I can't feel tight hamstrings or trigger points in the arms or adhesions in the rhomboids through layers of clothing.
I don't know where you got the idea that all massage was erotic or that women get sexually excited during a massage, but you were sadly misinformed.