the douches I would think would only effect in the vj, douching after, the sperm have swam past the vj, the douching 1/2 hour after is to refreeze the y sperm so they don't start swimming again, if you were going to do a cutoff, douching 1/2 hour for days 2 days would be hard, even when sleeping, as an O+12 you keep douching every 1/2 hour for 4 hours because the egg is waiting so they keep getting zapped and the females hopefully win. HTH