Yeah, it is. Because in guys, the pubococcygeal muscles support the urethral structures and all the semen-producing plumbing, and so stronger muscles help make those ejaculatory spasms stronger and apparently help strengthen men's ability to last longer. I wasn't sure whether they called the exercises Kegels when recommending them for men, but apparently they do. I found this.

http://www.askmen.com/love/love_tip_60/67_love_tip.html

PC muscles are wonderful things.