Well, according to some of the latest studies, ALL men check out the packages of other men to some degree. As I've said before on other forums, I think it's about dominance at the core. Sure for some it's sexual curiousity, but even for the 100% straight guy, he's checking out the competition. I'll admit (and I'm 90% straight), that I notice men who are physcially taller or have bigger chests or arms, or just look physically intimidating when I'm in any public arena. I try to be aware of who is around me and what perceived threats may be in the area. I also admit to checkin the crotch area on most guys I come across in public and private. I don't DWELL on the area, but I definitely notice how the guy carries himself and his package. If he's all about hiding it, and I don't mind showing mine some, then I can probably dominate the interaction and win any disagreement.
My experience has shown that the guy who is showing some bulge is also doing so to say "Here I am. Warning to other males, this guy is on the block!" It is a type of invitation to sexual notice and to physical and social hierarchy. I can attest that in high school, even though I wasn't physically tall or intimidating, I was well hung enough that other guys gave me respect. I personally think it's hard wired (no pun intended).
