When I could not get my wife pregnant after a year of trying, my wife started having sex with her ex-boyfriend to start a "friendly" competition. He was cool with possibly impregnating her because he also despises me. Every time they had sex he wanted me to watch and taunted me that he had to do the job that I could not. After a month she was pregnant. During that month, I had sex with her twice while he had sex with her every day. He has sex with her to this day and while both our kids could be mine, they look a lot like him and are most likely his.
When I asked my wife who she thinks the father is, all she said was: "Hey you had your chance. Now don't complain if you cannot get the job done." My wife is also rather happy that the kids are from him because she said she was afraid that if we had a son he would inherit my tiny penis.