I can't imagine the following birth scenario but according to a midwife, this happened on her first day at a new job:
Arrived to couple A and DW, DH and DW's parents were all present. DW mentions to midwife she'd heard an orgasm during labour can help with pain. Midwife leaves room and returns later to DH down at the 'business end' pleasuring DW all while mum and dad watch on. DW has orgasm, DW's dad falls to the floor with having a heart attack
I think my dad would have a heart attack in such a situation as well!!