Sometimes, when guys are under work stress, then they lose their interest in sex!
Also, another thing I found out when women are into sex so much, then guys are withdrowing....it's so sad...but it's true....we always have to show that we are not that interested, then they go after it!
probably, you just have to cool it down for awhile, then all will come back...
the good news is that you are at least getting that two minutes session...hehehehe...
good luck
MT