La Toilette arabe

We have an Arab student staying with us.  He's quite nice - very quiet, eats a bit pickily, goes out a lot and is generally no bother.

However, there is a mystery about his toilette... he seldom bathes or showers (except after his weekly football session) and has only sent one load of items to the wash (in 4 weeks) - which included no socks or underwear.   He smothers himself in a strong perfume - which now scents the room - and airing it does not remove it.  It is not unpleasant, but not to everyone's taste.  Is this normal behaviour?  Whatever happened to all that pre-prayer washing that Muslims have to do?  Perhaps they only wash if they pray - and if they aren't religious?