It would be about a month after surgery before sex would be safe. Start off slowly and be careful not to damage the treated area. Your scars will be prominent and swelling will still make you look larger than you should but having sex at that time would not compromise your recovery if you do it gently. After 6 months to a year, you should be fully recovered and be able to resume normal sexual activities without restrictions.
Wait times will average depending on the extent of the tummy tuck. A mini tummy tuck has a shorter recovery time compared to the regular tummy tuck and the extended tummy tuck. To be on the safe side, wait 4 to 6 weeks.