Conversely, it may decrease the risk of other cancer types.
If you're naturally on the dry side, or have a difficult time producing enough lubrication naturally, then period sex will likely be a welcome break from needing lube.
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If your partner has a STD, you have a high chance of contracting it and you should be using a condom during intercourse, both during periods and otherwise.
There are also some prescription pills available that only give people a period every 3 months.