Even though it's not the reason given in the article; in my own personal experiences I dislike sex scenes in movies/ TV (even though sex is a natural thing) because it rarely actually adds much to the plot that you could only get by seeing the sex happen.

People like to joke that you never see TV show/ movie characters go to the bathroom or say goodbye before hanging up, but there's a reason for it. Story telling is a time constrained medium and you need to trim the fat when it comes to unnecessary details.

With that in mind, sometimes it really feels like the only reason a sex scene is being shown is not to advance the plot, but for the audience's titillation.

Of course, all this is just my personal opinion, and not an objective fact; but to me sex scenes are rarely important to the plot and just feel unnecessarily tacked on.