You can rant all you want about religious nuts and puritanical politicians, but you probably haven't considered the whole issue until you've mentioned greedy lawyers.

As a disclaimer, I am not a lawyer, I don't play one on TV, and I am not privy to the workings and thoughts  of Bondware's management or legal departments.

A quick story that I hope will make some sense. Years ago I worked at a printing company. We had a lot of customers of varying types throughout the country. We weren't having a very good quarter, and one of our salesmen, who existed solely on commission, brought in a prospect who published soft core... well, porn is too strong a term; I saw samples, and I'd say the content probably wasn't much worse than the pinups here. However, I was forced to oppose --rather vigorously-- our taking this client on, even though the money looked good. Why? Because under state law at the time (I don't know whether it's changed; I just know that I changed jobs!), I could personally be named in a lawsuit for sexual harrassment if another client happened to walk into my office as I was preparing the soft-core files for printing and got offended at it. I could get into legal hot water, my employer could get into legal hot water, and the soft-core client could get into legal hot water. It wasn't worth the short-term gain, and I eventually prevailed --but not before hearing all the arguments I'm reading in these threads: "What are you, a puritan?" "It's a freedom of speech issue!" "Do nipples scare you?"

Bondware is a company. Bondware likely has a legal department. Bondware's lawyers have likely told Bondware that all the nudity filters in the world won't protect them from an ambulance chaser who sees a chance to make a buck. Yeah, we all know you shouldn't look at unfiltered Renderosity galleries at work, even during lunch. We also all know people do it anyway. The lawyers do, too. The employee would be at risk (no problem; his fault), his employer would be at risk (no problem; they employed an idiot), but the deep-pockets theory of legal wrangling in this country means that even Bondware would be at risk if someone thought there might be some money in it. Even though Bondware would likely win any such challenges, the damage to their bank account and reputation probably make it worth it for their lawyers to dictate that all thumbnails be G-Rated, period. Yes, everyone's still at risk if the user is looking at the full-size nude image when someone walks in and sees a chance to put their kid through college, but the thumbnail policy limits everyone's, um, exposure. We as users can live with that or go somewhere else.

I can't say with any authority that that's Bondware's official position, but as a person who's been in discussions like this at the company level, I bet the lawyers have been involved. Blaming it on individuals who can't handle nudity is convenient, but probably not altogether accurate.