Be polite, yes...but if you're friendly in school, it can become very difficult to turn down offers outside school. You can become very friendly with someone just by spending a semester with them in school, and that can create a dangerous connection.

Wow - you truly are amazing! Analyzing the problem, and already coming up with your own solutions - like sitting in the front row!

If those imageries work for you, then maybe...I don't know enough to comment on that.

I would suggest that you keep posting here, so that you have the support of the forum to deal with any situations that arise, and the constant chizuk that it provides.

Ummmmm, I hate to take away from your originality, but some very smart people said what your saying 1700 years ago. (I truly feel honored to be on the same forum as a jew who was mechaven to the holy Rabbis).
The gemara says "Isha chemas malei tsoa, upiah malei dam" - A woman is a thermos full of feces and her opening is full of blood.
My Rebbe explained to me, that Chazal are NOT telling us what a woman IS, but rather what to envision when one feels he is in danger due to desire. Meaning he should imagine the particular women defecating, and blood oozing out of her ----.
(The following is only my opinion) This is not a method which Chazal intended to be employed too often, because it can lose it's effect. This is only when one has done everything in his power to avoid all triggers, and nevertheless ends up facing a huge nesayon.
Just to give you an example of the extent to which one must avoid being tested...
The gemara says one who has two paths, one longer and one shorter, but the shorter has women rolling up their sleeves to wash cloths (hope I didn't trigger anybody there) he is obligated to take the longer route, AND EVEN IF HE DOESN'T LOOK, HE IS CALLED WICKED IF HE TAKES THE SHORTER ROUTE!!!

Yes, and not on your wife either.

Ha - but seriously, I would imagine that's the other danger of using it too much...it might become natural, and then you're really in a bad spot...