he was bemoaning women on nights out not being interested in him. He couldn't get that they might, just possibly, like dressing up (there are conditioning reaosns behind this, but they might genuinely enjoy it). He questioned why would they be all dressed up in their finery if it wasn't to attract the attention of odious toads like him?
As I once explained to a male acquaintance in a group of people I was with - well, I was young and a bit pissed, and less than tactful, and I think my words were along the lines of, "Yes, I am on the pull, but you're certainly not in the running!" Which, it later turned out, was pretty much what the man I was interested in was thinking about me, but such is life - I accepted that just because I'm attracted to someone, that doesn't mean they are attracted to me, or have any obligation to somehow satisfy my attraction - it's my problem, not theirs. Whereas some men seem to think it's your problem if you don't fancy them, and you do have some sort of obligation to them because they find you attractive, regardless of what you think about them.
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As for the sprig of rosemary - it's a herb I associate with remembrance and death, so if I saw someone wearing a sprig, I'd assume they'd recently lost someone, but I'd also be wondering about it, as not many people seem to know about "rosemary for remembrance" today. But that's not your point, I know - I just think you'd have to pick on another plant - I'm sure there must be some which already has links to sex, or at least fertility. In any case, I'm not sure a sprig of herbs in itself would be the same - I think a lot of sexualised clothing works because it is revealing and/or enhancing sexual areas of the body. It would have to be shoved down your cleavage, rather than pinned to your elbow.
I like the idea of stuffing parsley in people's ears, though. Especially if they're annoying.