I posted this thread on my favorite PSO board, and this is one of the responces. I asked there, cause it is their industry and the best to dispell missinformation. This comes from Miss Wamhottie:

Its against our regulations here in the US to send any adult content through a text message. FCC regulates that. For some reason its illegal to type in any kind of dirty message in the US and can carrys huge fines. Large enough to close a company down. Any text company I have ever worked for thats legitimate would flip out for spamming americans with gay porn. I can't even imagine what this person is thinking! Its just the law really and shouldn't be happening. Edit to add: when Texting a US customer you can't even use profanity of any kind what so ever. Sucks really cause they can say whatever the hell pleases them.