He showed something of a bulge in a series of modeling shots he did in 2001, some of which were also used to accompany an interview he did for Out magazine that year:
However, the best source for pictures of Kerr is at the Kerr's Secret website, which has over 5000 images in all, with some of the best (imho) appearing in the 'Site exclusives' and 'Scans & Photoshoots' sections:
I get a vibe that Kerr looks/acts a little gay, is it only me?
I saw the pictures of him getting married and all, but can't help it, he looks gay to me!
I thought he would be more hollywood body, more chiseled....I guess he can do that anytime, on "Justice" it looks like he got a better more athletic body already.
Kerr actually earned himself the nickname "Bulge" on TelevisonWithoutPity when he appeared on Charmed, because a scene featuring him, had him with an almost obscene Bulge.
I think Kerr was hotter back in the day than he is now. While hot, his bod is not god-like, and I see no real impressive bulge evidence in these shots, loks more just like jeans being jeans.
Would love to see the ChHarmed shots and be proved wrong...