Believe it or not, this can be a fun time with your wife or a date. Especially if your date is not ready for actual intercourse, but wants to have some sexy fun.
One of my ex wives and I did this occasionally, and it was a blast. What really surprised me was that with all the guys she had fucked over the years, she had never watched a guy actually beat off and shoot a load. She really got off when she watched me. We would get naked and sit across from each other, in the living room. I loved seeing her with her legs spread and working her pussy really good. That got me very hot and it didn't take too long before both of us were cumming and cumming.
I have read and heard of dating couples doing this for various reasons, and really enjoying the intimacy, and getting off together.