Wondering what he gets up to when you're not around?
You may consider him your other half, but even if the two of you are attached at the hip, there's most likely a side of your man that only comes out when you're not around.
And science seems to agree: One in 10 men is guilty of concealing some kind of sex secret from their significant other, according to research published in the Journal of Sex and Marital Therapy.
And while most habits don't pose a threat to your relationship, it's hard not to wonder what he's up to. To put your mind at ease, here are five common - and bizarre - behaviours that happen when two are apart.
1 His hands are always down there
Depending on what stage your relationship is at, you may catch him adjusting his boys every once a while. When he's on his own, chances are his hands are constantly engaged in the crotch clutch.
"It's not always a sexual thing either," says Emily Morse, a dating expert and host of US radio show Sex with Emily. Thing is , a lot of men don't even realise they're doing it.
It could be that while we have bras that provide us with support, men are left hanging.
"Cupping their goods provides them with a sense of comfort and security," says Emily, and eventually, it becomes habitual due to its soothing nature.
2 He's checking on you
The latest research shows that single men are more likely than single women to creep their potential love interest online - and that behaviour doesn't stop once commitment enters the equation.
"Men do not like to come across as to inquisitive or overprotective, so they often resort to acquiring their information elsewhere," says Emily.
If you happen to be a frequent updater on Facebook, Twitter, Instagram and Foursquare, your man can keep tabs on without seeming worrisome, she adds. So, yes, he will see that you accepted your hot new male colleague's friend request.
3 He stalks his ex
A recent study from the University of Western Ontario in Canada found that 88 per cent of people continue to keep tabs on their past loves via Facebook - even after they've been separated for a year.
"Whether you're male or female, it's pretty common to be intrigued with what your ex is up to, even if there are no romantic feelings attached to the behaviour," says Emily. Considering that you've probably peeked at your former flame's profile within the past month or so, don't feel threatened.
However, if you notice that the interaction has flourished beyond the realm of a random Internet search, establish some boundaries with your beau, suggests Emily.