In my opinion, men do not court women like they used to because some men have lost respect for women. Frankly, a lot of women act as though they don't deserve respect. They act like sex objects, as if their highest worth is merely their bodily assets.
Believe me, a lot of men (myself included) have a healthy desire to see women's bodies! They're beautiful. But when a woman is perfectly willing to display and even relinquish her body to a man -- and for free! -- without an obligation on the man's part to first give her a commitment of lifelong fidelity as a marriage partner, why should he bother with dignity, courtesy, and respect? The woman doesn't even respect herself.
As someone said, "It's the rare rancher who will buy a cow when he can get its milk for free."