Im gay, but sometimes I wonder what Ive been missing out in terms of straight ... what should i do?

Im 23 years old gay, and sometimes i really get curious about having with a girl. It seems so pleasurable. However, I feel bothered that if I do it, it will feel like I betrayed my girl friends who are so comfortable to be naked around me. I never had with a guy, though ive had oral. However, im sure that im gay because I really am by male body only. I just have have curious desires to a female sometime. (what should i do? please dnt remove this question.. this is really an issue for me that needs answers.)