I've noticed that my dick is up to 1/4" longer when standing up than when lieing down. Has anyone else noticed the same thing? Could it be because of gravity increasing the resistance of blood flow when lieing down, or could gravity be causing the penis to sink a bit? I haven't had sex in quite a while and have grown accustomed to masterbating while sitting. So perhaps it could be to do with the fact that I now find myself getting slightly less aroused when masturbating while lieing down? I might have to masturbate lieing down for a few days, to see if my arousal levels increase, along with the length. Any thoughts would be appreciated. Thanks.