post finasteride and post urination shiver

Hi
I wonder for a very peculiar but true observation about myself.
When during prefinasteride days i used to urinate, just after i used to finish the activity, used to get a slight ( really tiny) shiver.
That can be explained as body looses some heat it tries to counter by sending a signal to every organ to increase the temp ( my theory)

However, after post fin i dont get those shivers even I observed on really cold days or early morning.

Any body else observed the same thing.