Watson and Holmes in “Unfinished Business”

Watson

I've got to go meet my friend soon. Are you going to be okay getting home by yourself?

This friend that you're meeting, when was the last time you slept with him? It's quite obvious it's a he and an ex-lover. You go out of your way to avoid gender and every time you talk about him you avert your gaze when say "friend." As to how I know it's not a current lover, your walk speaks volumes.

Watson

My walk.

A study in Belgium showed that a woman's recent orgasmic history can be discerned from her gait. Yours would indicate it's been a while.

Watson

Is it sad being wrong as often as you are right?

My advice: sleep with him. It'll do wonders for your mood.