About 4 and 5 calories per minute so, but obviously it varies by how vigorous the sex is!
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Having sex could burn up to more than 500 calories.
All sex positions burn calories. Here is a link to a webite that lists a lot of positions and calories burned. Hope this helps... * http://www.c4vct.com/kym/humor/csex.htm (not sure how credible this site is but it does have a lot of numbers and is at least funny!) * http://www.fitday.com/webfit/exerciseinfopage.html * http://www.disabled-world.com/artman/publish/calories-sex.shtml
When having sex, the muscles of the body tend to tense up. This tenseness can lead to cramps.
The Y chromosome is the male sex chromosome, but males also carry a X chromosome from their mother. XY. The female sex chromosome is the Y chromosome; YY is female. ( generally, as sex chromosome number in both sexes can vary )
It's NEVER safe to have unprotected sex. Use some form of contraception, risking it isn't worth it.