I have written a large number of stories involving characters who are either pregnant or want to become pregnant. It is a fetish of mine, which I consider to be on the tame side considering some of the fetishes out there. I have always found that readers love reading about pregnant women and breeding stories, especially those involving cheating wives, are always a popular read.
I have put together the knowledge that I have learned over the years to help authors in making their stories realistic when dealing with breeding.
Basics
1. A woman needs to ovulate to get pregnant. Most women will ovulate once a month, or every twenty-eight days. That's the average cycle length although some women can have shorter cycles, around twenty days, and others can have longer cycles, forty to fifty days.
2. A woman is most fertile three to five days before she ovulates. That is when she will have a lot of fluid and will feel wet 'down there'. If she doesn't get pregnant she will get her period between ten and sixteen days after she ovulates.
3. Men produce millions and millions of sperm. Sperm is not semen. Semen is not sperm. Semen consists of sperm along with other fluids to help the sperm along its way. Men do not ejaculate gallons of semen however the longer they go between orgasms, the more semen there will be. The reverse is also true. The more times a man ejaculates, the less semen there will be.