How much sexual content is there in DMC?
When the ESRB rates a game, they include information about the games content and why it received the rating it did. In the case of DmC Devil May Cry, they say the following on its sexual content:
Some scenes also depict sexual activity: scantily clad strippers dancing/gyrating provocatively with each other; a woman moving her head toward Dante's lap (fellatio is implied). During one cutscene, moaning sounds can be heard while a female character is bent over a table—a man is positioned behind her, though there is no actual depiction of the sex act. A handful of still images (i.e., concept art) portray women with exposed breasts and/or buttocks.
You can find the full break down of the rating on the ESRB website.