There are a lot of socio-biological ramifications of this. Male animals fighting over who gets to mate with the females, butting heads and locking hor...s for dominance. The word 'horny' comes from these testosterone driven male competition displays. I'm becoming pedagogic again, aren't I?Well, the pheromones that are produced by the females are short lived. After all, they are complex, long chain molecules that disintegrate in air. Once the fluids that protect them dry, they deactivate. People. Magically, we both reached our peak at the same time once again and our cocks exploded together, our hot juices mixing between us as we rolled and writhed. Slowly we both relaxed and I almost fell off the narrow table which made us both laugh. After another less dramatic clean-up in the shower we returned to the living room to collapse in chairs.I looked across at Brett and asked him "Did you enjoy all that action?" He looked back at me with a sheepish smile and said "I have never done anything. My body went into spasm as I hit climax jerking me off the bed and i began to cum shooting load after load of sperm on her hard. As my orgasm subsided I fell back on the bed panting hard.“Wow that’s a lot of cum” Laura said smiling proud of herself.“Damn girl, you sure know how to please a guy. I’m jealous of your boyfriend”She laughed. “I’ve always fantasized about suckling your dick.” She said liking my cum from her hand. “Really?!?” I looked t her surprised. “mmhmm” She nodded mouthful of. We went out in a foresome on a couple of occasions and with bigger groups,but nothing came to light,i thought Pat had forgotten,but then one night Mary and i were on our own watching a late movie when she suddenly asked if i had ever been in the swap scene."what made you ask that"?i asked."well,have you"?"i wont lie to you,------yes i have----with my second mrs" and your last" she stated."how did you know that"?i inquired."a little bird told me"she smiled.she went on to ask me lots of questions.