My wife was with a new lover which in and of itself is nothing new. But she recently decided to stop using her birth control, and we have been using condoms. 

It's not unusual for her to let someone initially penetrate her before putting on the condom,  and it normally happens very quickly before his dick is wrapped. 

Last weekend she brought home a guy in his early twenties.  I was enjoying watching them and he began penetrating her with his 7 inch hard cock. He was attractive and had a good build.  I mentioned to her the condom as i could tell he was very aroused and standing straight in the air when he wasn't inside her pussy.

She played it off,  and told me how good he felt.  He promised he wouldn't cum in her but after several minutes of intense fucking he pulled out as he let out a large moan.  His hard cock was standing upright and throbbing, I could see a small amount of cum sitting in the tip of his penis, and his whole cock was glistening and wet. My wifes pussy was very creamy. I asked if he came and he denied it. My wife grabbed his cock and a little bit of cum oozed out,  as she stated to me that he held it in and pulled out. It was clearly evident he came inside her. 

My wife was very turned on over the whole deal,  she won't let me cum in her or even get close.  I'm positive he came inside her,  its a huge turn on but major risk of getting pregnant.  My wife has become a total slut to her lovers. Seeing his cock pull out after completing its task was the most erotic thing I could watch my wife experience.