Gender Differences Exist in Sexuality

Gender differences exist in sexuality.It appears that these differences:

A) are not due to biological differences caused by the relative visibility of anatomy.
B) are related to cultural factors such as the double standard and gender roles themselves.
C) are not really affected by the possibility of pregnancy on account of the different forms of contraception that are available.
D) are related to the levels of estrogen in the bloodstream of women.