There are a lot of awkward, bad euphemisms for sex. We don't need to make a list here. You're doing it in your head right now. Many of those phrases fall under a category that might be best explained as amusing, but not suited for use around your partner. At least not in a serious way.
Thanks to an article in London's The Times, you can add a gem to that collection. In a perfectly reasonable article called "I’ll tell you what’s wrong with midlife sex — the telly," the author Carol Midgley used a phrase that caught the attention of social media. Moreover, it wasn't just in the article but was used in the publication's tweet about the story. (In the article, Midgley discusses research from the University of Delaware that says people who own a TV set are 6% less likely to have sex in any given week.)