I think there is a misunderstanding here. While some girls are lezzie or bi, most girls in the business do other girls because there is an audience for it. Moreover, some never go to boy/girl because doing girls remains within their acceptable range plus it is cleaner and less dangerous from an STD standpoint that doing guys. Also, for the girls in the industry who have boyfriends, the boyfriends are infinitely more tolerant of G/G than guy stuff.
Porn is 99.9% fantasy plus business. It is important to keep your feet on the ground and your fantasies under control. Don't let real-life get mixed up in your porn