So, did you notice that our speaker is totally talking about his mistress' lady business when he describes the "deep wound" (2) she's given to both him and his friend? If you did, you probably also caught the reference to what sex with his mistress feels like when he's "pent" (13) inside of her. Of course, there's also a shout-out to the size of his, er, manhood (and his friend's manhood, too) at line 6. So, yeah, we're giving Sonnet 133 an "R" rating. What's more, we're also going to give "Sex" its very own category in "Themes."