Sure it is. We start out being conditioned as infants for all different aspects of life. Conditioning is simply a series of situations where we are taught or we discover by accident that we will experience certain outcomes to certain stimuli. There are conditioned and unconditioned stimuli that are responsible for such.
On this site is a Pavlov experiment called Little Albert which shows how a child might be conditioned to dislike something. The same type of experiment could be applied to sexual encounters. So yes, it's natural to want to fool around right outta the shower if you always shower before sex. We can all certainly understand that!!! Oh, at least those of us that shower. Personally, I have to shower now just to fool around. So, it has kinda put a damper on spontaneous sex if it's been an hour or two since I showered...:-(. Friggin' conditioning!!!! LOL