Women like different types of guys depending on which stage of their menstrual cycle they are at.
During the fertile phase a woman is attracted to muscular, tall, dominant alpha male types.
During the rest of the cycle a woman is attracted to softer, gentler, more reliable guys.
Basically, she wants to produce offspring with the good genes from the alpha male, and raise the kids with the reliable breadwinner who won't cheat and desert her, and will support her until the children are old enough to fend for themselves.
Birth control also changes the types of men women are attracted to, women often find their partners less attractive when either going off or going on birth control.