Fanservice: For Your Viewing Pleasure
Matsumoto (from Bleach). The ghost-fighting team of "soul reapers" suddenly abandons their world-saving duties and breaks for the beach. They’ll be back for more monster-ass the next episode.
Those breasts can't be practical.
Fanservice: When lacy panties, butt-shots, ripping clothes, and other sexy eye-candy appear just to titillate. Popular examples are the busty lady in skimpy clothing (see above!), Random and Nonsensical Beach Day Episode, and Peeping Tom. Other fanservice can be subtler, such as sexual puns, quickity-split butt-shots, or a female villain turning her devious charms on an unsuspecting hero. Most fanservice is designed for the male audiences, but there is plenty of stuff for the ladies as well.
Yu-Gi-Oh! provides via kinky female characters, but they're some sexy men too. (Actually lots of sexy men. But it's not to say that every handsome bishounen is fanservice for girls. They might all just be pretty because Cool/Good = Beautiful. And sex sells.)