Hello Biso69, there are 2 issues to it.
1. you need to see a doc to see if you need surgery. If your virgina opening is too wide, the surgery will solve the problem.
2. if missionary position is what you think is causing the delay, why not use other styles. You can equally use pillow case to prop up your waist region and maintain that position 30 minutes after the show with your husband.
i hope this helps you and others out there.