sex up

基本解释

The question of why a boy might prefer one sort of sticker, and you might get a different response with a girl, is going to come up later when we discuss different theories of sex differences.
至于为什么男孩偏爱一类贴纸,而女孩偏好另一类贴纸的问题,等稍后我们讨论两性差异的不同理论时,再进行解释
耶鲁公开课 - 心理学导论课程节选

Sure, Morgan is trying to push his violence and sex up a notch in the book.
FORBES: Book Review: 'The Steel Remains' By Richard Morgan
Prozac's least-popular side effect is a diminished sex drive, and when patients complain to their doctors, they often end up taking Wellbutrin, which can heat the sex drive back up, in addition to Prozac.
FORBES: Prozac To Fight PMS Under New Name
Most states leave the scope of sex education up to the local school boards.
NPR: Teen Sex, Sex Education And Sarah Palin

To sex something up means to make it seem more attractive or interesting than it actually is.