I don't want to hang out with my wife's friends because they talk about NSFW things.
I'm not really sure what you mean by NSFW things?
I am uncomfortable with them because they're obsessed with sex.
While it is expected that you make an effort to be social with your spouse's friends, you are not obligated to listen to everything they say if it makes you uncomfortable. If your wife's friends continually talk about sex and you don't like it, you should speak with your wife so that she can bring it up with them.
They are so annoying, even when I am reluctant to hang out with them.
You should still try for your wife, but maybe explain to her that you don't like how overly sexual they are? Maybe she will understand and allow you to spend less time around her friends.