"If sex is a full-course meal, then masturbation is like a snack," Wako University sexologist Kim Myung Gan tells Shukan Jitsuwa. "Of course, some couples may find a full course a bit too deep or a bit too painful at times and instead find it easier to go out for a snack. It's a better idea to decide on whether to have sex or masturbate depending on how you feel at the time. That way, couples can avoid problems that could otherwise ruin their relationship." [MDN:WaiWai]

I quoted this to a friend online and the following brief exchange ensued:

You say "Is there something wrong with their simile there?"
You say "I haven't often found a full course dinner to be too deep or painful"
friend giggles
friend says "depends on where you put it..."