Jack of Hearts (and Other Parts) is deliciously sex-positive. Jack is gay, so most of it gay-gentric, but there are also tidbits of lesbian-centric and even asexual-centric positivity.
Jack and his two best friends Jenna and Ben go to a private school in NYC. Jenna, who has an investigative website, convinces Jack to write Ann Landers-style sex advice to anonymous emailers. Jack has lots to share because, as he says, he likes having sex and isn't shy about it. Things are going swimmingly until Jack starts getting these mysterious origami-folded, pink notes in his locker. They start out innocent enough, but quickly become stalker-y, which leads to the three friends investigating. The culprit is unexpected, which makes for delightful storytelling.