I just don't see why there should be anything wrong with it. You can imply that a character drove from one place to another, but that doesn't make it wrong to show them driving. You can imply that, ohh, MacGyver put together a makeshift gadget off-camera, but that doesn't make it wrong to show him building it on-camera. By treating sex as somehow less acceptable to depict than other human activities, you're implicitly saying there's something bad about it, and I don't accept that.
Anyway, it should be up to the individual storyteller to decide whether a specific story calls for depicting a specific thing overtly or not. That freedom of choice is essential. For audiences as well as creators, because different audiences have different preferences. The fact that you personally don't like something doesn't mean it has no value, because other people have their own distinct tastes and it is absolutely good and right that they do. There should be different kinds of story targeted at different audience tastes and sensibilities. For instance, I don't write my Star Trek fiction with the same level of adult content and language that I use in my original fiction, because I'm writing for distinct audiences in those cases. You might be more comfortable reading my Trek work than my original work, but my goal is not to target only a single person's tastes.