is it OK to have sex between family members and relatives? I

is it OK to have sex between family members and relatives? I like my uncle, and I'm pretty sure that he has a crush on me, I can feel it whenever he drop by out house sometimes for dinner. he once entered my room while i was studying, and he came close to me, and i was feeling the chemistry working between us, but suddenly my mom entered the room to announce that the dinar was ready. I know people would say this is not a good thing to do, and forbidden in society and religion and morals but i really love him, i wish I lose my virginity with him and get pregnant p.s. I'm 20 y/o, so i'm not a little girl, and my uncle is in his late forties i wish if he was not my uncle, so i could throw myself between his arms (and legs) and stay there forever