What makes you lose attraction in a woman or man?

She is using a siren while chasing me.

Nagging did the trick for me

Laziness and 'proud stupidity' .

Aggressiveness towards others or myself.
Playing the blame game, they are clueless or refuse to own their own part.
When their focus is more on past relationships or other women than on me.
Other than that... lying, stealing, and lack of integrity.

The opposite of those things are what attracts me, and are the things that are most important to me.

There are a lot of things that could be named I'm sure...

To me the main one is Cheating quickest way to loose my attention/love..

Any kind of abuse verbal or physical--- verbal from time to time is one thing but once they lay a hand on ya it is over for me---even tho I have never had a man lay a hand on me in that way.. I do know women that have went through that... The stories I have heard from some would make a grown man cringe of what they went through...

Honestly beyond my main one most flaws can be over looked or dealt with in a way to get things to change through communication... For we all have flaws and things that may drive another crazy but not enough to stop loving them..

Laziness, any form of abuse, bad personal hygiene

Lol, I don't like 'uniforms' much either.

Ouch. Yes nagging would do it....

What is proud stupidity?

I agree with you there. Especially on the blame game or "I am a victim" when they feel sorry for themselves.

Domestic Violence is still rampant everywhere. I see my neices take back their abuser and it breaks my heart, because you know it is not going to end well.

It isn't the uniform. It's the capture that I don't like.

Smelling like roadkill is a definite attraction killer

Hmmm, some men may like that sort of thing...

LOL, I have to keep that one in mind

Yes, that's annoying and a major red flag... it tells me they can't or won't take responsibility for their own behavior.

One thing that pertains to online attractions with someone I may be interested in or they are showing interest in me... if they are paying attention to me in the forums but never private message me, or vise versa, private message me but ignore me in the forums... I tend to lose interest in anything more than friendship rather quickly.

Mostly things that I don't feel are very masculine. Funny how I cannot think of a good example now, even though there are specific things.
A guy being nervous, biting his nails because of it.
Someone not having real self-esteem and confidence.
When a man is 'weak', doesn't have a backbone
A man who always goes into victim mode
A guy who's a pleaser.

Basically all these are signs he's not very masculine. And things that make me lose respect, and when that happens it's over.

Also poor body hygiene and self-care.

When they lie to you. Then they tell you to deal with it.