mmmm, yes I've done that. Had a bf once who ejaculated so fast, we were real young, and before I taught him to make sure he gave me an orgasm orally or by masturbating me, he would cum almost as soon as his penis was inside me. I would lie in his arms and he would hold me while I used his semen to lubricate my pussy and clit and masturbated to get an orgasm. Sometimes it would make him horny again watching me and we could make love again and the second time it would take him longer to cum.