Some returned because they missed the food. Would you pay $5 in their local currency for 2 pieces of parta or $8 for a bowl of laksa or char kway teow :(
You should avoid missionary position for a while because when you bang your partner, your left ball hit too hard on your partner.
Switch to cowgirl for 6 months, the ball's pain will go away
Then you can try missionary again when balls no pain :D