Some men and women are attracted to menstrual blood and desire their partner the most when they are menstruating. Usually there is an aversion to oral sex, cunnilingus during this time, however, some people do not have an aversion to this. If you desire performing cunnilingus during a woman's period, it is perfectly okay. Again, it is truly a personal preference. Remember that all STD rules still apply.
Can You Get Pregnant?
Yes, while a woman is least likely to get pregnant during her period, she can. During menstruation a woman's body is flushing out both the unfertilized egg and the lining her body prepared for the possibility of a fertilized egg, so it is quite difficult to get pregnant during this time. Yet it is not impossible.
Sperm can reside inside of a woman's body for several days after sex, and a very slim chance exists that these several days will extend into the beginning of a woman's fertile period. The greater risk involved with having unprotected sex during a woman's period is that she has mistaken spotting or other midcycle bleeding for her period. If this is the case, then a woman may be having unprotected sex at a time when she is very much fertile.
It is also essential to remember that menstruation does not protect either partner from contracting HIV or a STD! Both menstrual blood and vaginal secretions can transmit STDs and HIV, exposing the partner of any HIV+ woman to greater risk.
Also, many women with Herpes experience flare-ups during menstruation, making themselves more vulnerable to HIV or other STD infection through open sores and their partner more vulnerable to Herpes. There is also some debate over whether sex during menstruation exposes a woman to higher risk of pelvic inflammatory disease.
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