How often do girls hook up on internet dating websites? The answer varies greatly. According to one review, 33% of women have sex on the first come across. Sixty percent of female Tinder users say they are looking for a meet, and 9% report assembly potential legit hook up sites beaus in bars. What is the reason for this happening? The study also reveals that women are more likely to participate in sexual activity with guys that they meet by using a dating iphone app than men are.