Mutual desire is the essence of sexual relationship.
A man taking a woman out to dinner
Is paying to felicitate her desire for him.
A man hiring a prostitute for sex
Is paying for the absence of her desire for him.
Waitresses showing cleavages get extra tips.
The motive of men is to be endeared by women.
The motive of women is to shine and attract men.
All the ethics are put aside for the moments.