It only gets hard when she moans
	
	
		I can get an erection, not a problem but it seems to be that during sex it sometimes goes a little limp :o Its not because I'm not enjoying it, I am, its just that I start to worry "Is my wife enjoying it to?"  Its then my mind starts to wonder and then I start trying to hard to make it enjoyable and that's where I can't bring it back to life.  Once my wife starts moaning and enjoying it then I get hard again and we both end with an orgasm.  This limp problem isn't an issue though when we are having se Doggy Style.  I don't know if this is because of the feeling of it or what.  I know that the problem starts in my head but I just want to know that I'm either not the only person like it or that there are things that I can do mentally to stop this.
Its not causing any sexual problems yet but I want to put a stop to it now before/incase it does.
All feedback is welcome.
Thanks :)