When can sex resume after abdominoplasty and muscle tightening?

Thank you for sharing your question.  Much will depend on the exact procedure performed, and how your recovery goes, but in my practice I ask patients to refrain for at a minimum of 6 weeks.  This will allow for the muscle repair that accompanies most tummy tucks to heal.  Hope this helps.

Congratulations on having undergone the tummy tuck procedure.  Your plastic surgeon will be your best resource when it comes to specific information/advice. He/she knows exactly what was done and how you are progressing. Concerns would include an increase in heart rate and the potential for bleeding. Muscle spasm may be painful. Obviously, significant pressure on the surgical site is not a good idea either. It is not uncommon for patients to report increased swelling that occurs after vigorous exercise (including sexual activity), even several months after tummy tuck surgery. 
In my practice, I ask patients to wait until they are four to six weeks post op ( assuming gentleness and creativity) before resuming sexual activity. I hope this helps.

Once your partner has had an outstanding, attractive abdominoplasty by one of the amazing Board Certified plastic surgeons in Dallas, who can blame you for wanting to have sex with him or her.  
Since the muscle repair of the rectus diastasis is 75% healed at 6 weeks, I personally believe this is the earliest one should consider having sexual intercourse.  Even at 6 weeks, the shearing forces created by several of the well known sexual positions may increase the chance of a seroma or even a delayed hematoma, and therefore depending on your preference of positions, one should consider 2 months as a conservative time frame for active and aggressive sexual intercourse.