Well, since shakeit is a girl I don't think she'll have to worry about tensing up during ejaculation
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I don't know if you've ever had a child, shakeit, but trust me that will screw up your love life WAY worse than LIS surgery will. I think my husband and I waited a couple of weeks until most of my soreness was gone after the surgery. It may have helped that the surgeon makes the cut closer to the spine than the vagina. If you can have sex with a fissure, you can have sex with an LIS incision. It won't be too bad, really.