Happened for us the first time by accident really. The accident was I did a 2 minute drill after being apart for a month or two.
Couldn't leave her hanging , so I dove right in! Best thing I ever did.
After that first time, and the way she orgasmed, I did it again.
(and again and again.....)
Me doing that may just be my wife's personal thing, but she can't be the only one!