I never see threads on this, but it's always made me curious. My first sexual relations with another human being was with my male best friend when both he and I were curious about sex. But shortly after that my second sexual contact was with my brother which continued on for some time. It was just enjoyable to pleasure each other and as long as it was our little secret neither one of us felt bad about it. It ended when he got a serious girl friend but in the meantime it was pleasurable for both of us.