It's hard to find art work on this site that provokes genuin physical intimacy between characters, and I think this is a great example of not just showing "sex" itself, but 2 characters engaging in this activity together, being on the same page, and showing affection, care, respect, and luv. The eye contact and body contact is very important as well as the kind of "viewpoint" you are offering to the audiance (this is coming from a virgin).