Japanese Sex Essentials

This is an English translation of an educational Japanese blog about sex in Japan and sex with Japanese people. All images and words are copyright the original author, poza.

Can internal ejaculation during a woman's period cause pregnancy?

Original Post

Have any of you ever had sex during a woman's period? I have sex with my partner even when she's on hers.
sex during period

Being on her period only lowers the woman's chances of getting pregnant.

I've heard many stories about people ejaculating inside their partners while they're on their periods thinking that it would keep them from getting pregnant. I've also done it myself. (And it did feel good...) But the question is, can a woman actually get pregnant while she's on her period?

The answer is yes. It's possible to impregnate a woman while she's on her period. Ejaculated semen can live from four to ten days inside a woman's vagina and womb, and it's possible that a new egg could be impregnated during that term. Also, with women whose periods don't always come at the same times, it's impossible to accurately predict when she will or won't ovulate.

Sex encourages ovulation.

When mammals have sex, the stimulation causes more hormones to be secreted within their bodies, encouraging ovulation. Humans are also mammals, so it's possible that sex could encourage ovulation within us as well. This means that period or not, having sex always means there's a chance the woman could get pregnant.

Period sex is unsanitary.

When a woman goes on her period, her endometrium gets torn off and her cervix opens wider than usual. In other words, it's practically defenseless against viruses and bacteria. This is another good reason to avoid sex while a woman's on her period.

If you still want to have sex with your partner while she's on her period, then I suggest using another contraceptive method. But thinking of how unsanitary it is, I really feel it's best to avoid it altogether.
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