HND stands for Horizontal Naked Dance on the website SparkLife. It is a euphemism for sex employed by both the site's paid bloggers and its users.
In this example, a SparkLife user is writing to the advice columnist Auntie Sparknotes for help.
LW: Auntie, I want to do the HND with my boyfriend but I don't want to get pregnant.
Auntie: When you decide to HND, it's important to use protection! Here are some HND-safety resources.
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