I think everyone desires, at some point in a relationship, going out of it for some sort of satisfaction that they aren't getting from their current partner because no one is perfect. There are times in every relationship I've been in that something has really sucked that I've thought, I'd really like some strange new dick. Hell, things can be great with the husband and I meet a guy with a nice face/body/personality whatever, and I wonder what it would be like to bang him. A pretty hot cock is just another one of those things that gets my libido going. So yes, I'll admit it, I've thought about it, but not seriously. Usually along the lines of, "Man, if I wasn't married, I'd so fuck him in a New York minute." (Wasn't that an Olsen twins movie?)
But that's what LPSG is for. I get to look and read about sex and cocks and it's fun. My husband knows I'm here, and though he doesn't quite get why I enjoy photoshopping dicks and talking about sex incessantly in my spare time, it doesn't bother him. We have a good sex life.
I think everyone for myriad reasons fantasizes about sex with someone outside of their relationship. It just seems very normal. And if cock size or appearance is your thing, you'll think about it. Doesn't everyone have some goofy fantasy that they hold onto? The grass is always greener and all that.
Christ could this be misconstrued like I'm asking for PMs and pics and cam sessions? Argh. No. Speaking of which, since I removed my gender etc. from my profile, my PM box is filled with only those familiar with me from posting. It's kinda nice.