I live in a small apartment. Therefore, according to the rules of feng shui and good sense, the LID to the toilet must be left down when not in use. Not just the seat, the lid. This isolates any unpleasantness, and makes everyone equal in that we all have to lift the lid each time.
The other rule is this: You live by the rules of the house you're in. If the owner of the house says seat down, or no food in the living room, or lights out at 11, then so it is. ...I have never seen a woman rant and rave on this issue (though I don't doubt MoJoe's word) but I have seen men whine and argue incessantly over such a tiny non-issue, and I think anyone of either gender who goes ON about it without a reasonable compromise should be made to LIVE in the toilet.