This goes back to our prehistoric human ancestors who were probably not monogamous. Like our cousins, the bonobos and common chimps, often several mal...s would mate with one fertile female within a few days of one another, sometimes in the midst of a prehistoric “gangbang.” These different men’s sperm would then duke it out within one woman for the evolutionary goal of fertilizing her egg, and so the male psyche was primed to find male competition arousing.How do Sperm Wars affect men today?. As her orgasm subsided, she lifted herself off Mark and moved down next to me. She started playing with my breasts, pulling and sucking on my nipples. I kept on sucking on Mark, feeling him growing larger and harder, and started rubbing her pussy with my free hand. Mark continued playing with her breasts, gently squeezing and tugging on her nipples. She was soaking wet from her orgasm and his fondling, and she started moaning softly and breathing more deeply again. I felt Mark’s cock swell and. I told her that may you were my girlfriend ,I would have loved her the most and would have cared a lot. She brought her lips near mine and said that tonight I am all yours. I was more than happy and just we lip locked and continued kissing for 15 min. I was caressing her hip and on the other hand, I was feeling her round boobs. She was also aroused and she pulled me to her bedroom. She took me above her and laid on the bed.We both were kissing as if there is no tomorrow. Then I tore her free. “Please excuse me.” She said and disappeared into the bathroom.I did a quick double take when she emerged after ten minutes. Wow! Did she look different! Stunning, as a matter of fact. She had changed into a plain white sari with a red border, the kind known as a pooja sari in Bengal. She wore a matching white blouse, quite unlike the conservative ones she usually favored. The blouse was at least a couple of inches shorter than usual, the sleeves were very short and the neck was cut rectangular.