What you say during sex often depends on who you're having sex with.
For example, you aren't going to tell the blonde you took home from the bar that you adore every inch of her existence, and how thankful you are she came into your life.
But if you're in a relationship, recent research has proved that talking it up while you're getting down will make sex better for both parties.
A study out of Chapman University quizzed 39,000 couples about their bedroom antics, and found there was one line that stood out from the bunch which boosted pleasure during the act.
And that line is? "I love you."
Saying "I love you" in the middle of getting it on was the top behaviour for guaranteeing orgasm for both genders, with 75 per cent of men and 74 per cent of ladies admitting to loving the line.
The couples also revealed that mixing it up and trying new things were the secrets to keeping your relationship hot, while taking time out to set the mood and focussing more on foreplay also boosted their satisfaction.
However, this only applies to couples. If you're having casual sex and drop that line, don't expect her to pick up any future calls.