GT,
What you are experiencing is a sign of correct cultivation. Guess what? Most women are filthy. So are most men, for that matter.

It has nothing to do with taking a shower either. Their chi is like a swamp.
Ever been with a girl and she is so hot yet you can't get erect? There is nothing wrong with you. Your penis has intelligence and is trying to protect you from the woman. A penis is an energy communication instrument.
Since most women are filthy and inherently egomaniacal, they get pissed off at your enlightened statement (as opposed to men who could care less if they are called filthy).
When your nose starts to open up, you will be amazed at how many people's internal organs stink of sickness. Some people even smell like the dead because they are, yet remain too stubborn to lie down.
There are 3 main ways that women get so dirty:
1. Poor Diet
2. Bad Thoughts
3. Undigested Semen (vaginas are NOT self-cleaning)
#3 will of course create the biggest uproar, but the fact is that virgin girls are so pure because they have not become a sperm toilet for men. As they say "it is easier to clean a pole then it is a hole." Contrast a farm girl from Fujian with bar girl in Pataya. The purity of some girls is amazing! Jealous females will say all sorts of shit to invalidate their purity, but those with some cultivation know what the deal is!
Don't get me wrong, I love dirty whores but my hellish tastes do not invalidate your heavenly observations--on my sexual menu spoiled meat simply has the best taste.
When I was 18 and still a virgin (I think I lost it as 20) somebody was making fun of me because I hadn't gotten laid. This old, grizzled man was hanging out in the area and said "He's just scared--and rightfully so. Maybe he instinctively knows women?"
How right that old man was. I can tell you that when the Taoists declared the bedroom a battlefield they weren't joking. Sexual relationships are a deadly war for energy and anyone who thinks otherwise is already a dead man or else a female covering her twisted (albeit perfectly natural) agenda.
There is nothing wrong with fucking anything, as long as you are aware of what it is that you are fucking. Listen to your cock. If you aren't naturally hard without thought then don't fuck that girl. If you think her chi is dirty then it is. If you even have the thought to use a condom use it.
Of course, Spyrelx has a good point. Don't use judgement of another to rationalize not being able to close a set. Try downloading the Mystery Method ebook if you want to up your game.
-P