Why would a guy need a certain girl for sex?

Anonymous
he's always tells me he doesn't want a relationship with me but he does with other women. Not even that but even when he is in a happy relationship with another woman, he's still contacting me for sex. He doesn't want me to be in a relationship with another man cause he knows he will lose me. Why does he need sex from me when he can get it from his girl?
Why would a guy need a certain girl for sex?
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