sex is normally only a bit painful for woman the first time.
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When having sex, the muscles of the body tend to tense up. This tenseness can lead to cramps.
About 4 and 5 calories per minute so, but obviously it varies by how vigorous the sex is!
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.
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