So, if my wife is walking past me and I give her a playful slap on the ass, I'm committing a crime? Damn. I'm gonna become a hardcore criminal in frequency alone. Kidding aside, I think I remember a lot of states having laws against anal and oral sex at one time. I don't think it ever stopped consenting adults though. I doubt people will pay much mind to these laws either, unless they start to actually be enforced. Then I think there might be a backlash.But there is a movement to make the same laws apply for everyone. The American Law Institute, which helps write the nation's criminal codes, is in the process of re-writing the sexual assault penal code to incorporate "Yes Means Yes."
In the US S&M always puts you at risk of assault charges, because it isn't possible to consent to "serious bodily injury" and "serious" is interpreted as "pretty much any injury at all". People don't worry about it much, because if it's consentual then the law will never be involved and it doesn't matter. This seems to be the same deal.