I don't get why chicks don't look before they sit down. It doesn't make any sense.
I do my part to leave them up every time.
Once I had a little trick for this girl I didn't like so much. I removed the seat entirely, and smeared a film of vasoline around the edge of the bowl. Then I unscrewed the light bulbs in that bathroom so they wouldn't turn-on. We finish, and I'm just struggling not to burst out laughing when she says she needs to clean-up in the bathroom. This was even better because she thought I was trying not to laugh from looking at her. She gets up, tries to be sexy as she walks out of the room, I just burst into laughter cause I know what's coming. I hear her get upset and slam the door of the bathroom. 5 seconds later, screaming. It was awesome. I hear thrashing so I open the door and thread a light bulb in a bit to turn it on. She is a mess, and she says "WTF is this TOILET SLIME on me!" and I said "I dunno, I think it clean before you sat there." She took the hint. It was not my best chick/toilet incident, but it was the only one I'm willing to post on a public forum.
If that seat is down when I gotta piss at their house, I generally piss all over it semi-intentionally. Or, if they are near by and the seat is down, I piss in their sink. When they ask why, I tell them the seat was down. They can quickly be trained to leave the seat up when you visit by using this system.
The trick with women is to give them real and serious concerns to have. My women would never mention toilet seat position BS, because they are much more concerned about other matters that they are scared to bring up, because they don't want to know the answer. Women like to fuss. It's my job to give them good solid material to fuss about. It's also my job to make sure they know that I'm not going to return their calls or bother to see them again if they ever make this fussing something I have to hear about.
This system works great, but I think it's best suited towards bachelor life rather than married life.
Enjoy,
-LUke