Sex After TT. During Orgasm (Before Penetration) my Lower Ab Muscles Began to Spasm. Is This Normal? Can It Cause Damage?

You were wise to restrict activity that could have damaged your muscle repair, as heavy lifting, ab exercises such as sit-ups or crunches, and yes, sexual activity that stimulates forcible contraction of the abdominal muscles, can tear sutures and incompletely-healed scar formation that is designed to hold things together for the long term.

Sex is fine whenever it's comfortable for both of you, but I recommend avoiding all activities (including more vigorous sexual ones) that forcibly contract the abdominal muscles for 6 weeks after tummy tuck and muscle repair. So you don't necessarily need to avoid sex, just the trapeze and chandelier variety! (You know what I mean.)

If what you were doing did not hurt, it was likely not a problem, nor will it cause any damage in most cases. The important words in the last sentence, however, are "likely" and "in most cases." Maximize your chances of a successful healing period by limiting things that might (inadvertently) cause damage. Your final result will thank you for your diligence and care! Best wishes! Dr. Tholen

This sounds like spasm of your abdominal muscles and should not hurt anything. However, you won't be fully healed for another 3 weeks so you may want to be careful. If it hurts, it is still healing. Remember, you should do no heavy lifting for 6-8 weeks.

Most likely you experienced a severe spasm of the rectus muscles.   This could, in an extreme case, cause a rupture of the sutures used to repair the fascial layer.  Better to wait another 3 weeks before you resume vigorous activities.