Is Divorce An Option Now That My Wife Can't Get Pregnant?

I should have known something was wrong while we were dating, my wife Tinu and I had been dating 3 years before we finally got married. For the first year, the relationship wasn't sexual as we were both far off, she was schooling in Abuja and I was living in Lagos. But after she finished in school, we finally got to meet, the first sex we had was passionate and everything we dreamt it will be.

After the whole show, we collapsed on the bed breathing heavily while laughing at how weird the whole thing was, I mean one minute we were both talking and touching casually, the next we were chewing each other up, making love to each other and grunting in sexual  ecstasy. It was then that it dawned on us that we didn't use condom! yet it was around her ovulation period, holy sh*t!

She said she'd do something about it and I trusted her to, a month after when she saw her period, I was curious as to if she ever used the drug, but her response was negative, she forgot, what! Immediately she finished her menstruation, we did a pregnancy test even though I already knew it will be negative and I was right.

After that event, we made sure we used condom before making love, but then again, you know what happens in relationships, we threw caution to the air and I can't remember the number of times we made love without using protection, yet she was never pregnant, I made it my duty to ask her if she used anything and before we could be getting concerned her period will peep in like "Hi, looking for me? I'm right here"

The relationship we started like play, play grew and flourished into something beautiful until we decided we have to seal it in marriage. I wished I had known about mamalette so we could have done fertility tests and compatibility before getting married, and that dear Mamalettes, was my greatest mistake!

Now after 8 years of marriage, there's nothing to show for it and during one of the fertility tests we did, we found the problem is with her, not me. I'm the only son of my parents and they want badly for me to give them a child (boy) that would carry on the name of the family.

I don't want to cheat on her and impregnate someone else, I'd rather we have an agreement or we divorce so I don't put a curse on myself by betraying love, 'cause truth be told, I still love her, but I need children to call my own and that's equally important.

How do I ask for my wife's permission to impregnate another woman, or should I just divorce her? How do I do this and not make her even more sad. Don't call me selfish, just try to put yourself in my shoes please.