It's nothing wrong in putting other people first...
Just don't do it in a way that diminishes your own value.
Let people know that you do this because you are a compassionate being...
If the girl feels safe with you because of your physical attributes.
If she still feels you are able to keep up the sexual tension, not releasing it out of misplaced care, which is probably the most well sprung trap for you.
And she also sees your ability to take care of those that mean something to you, this comes back to the safety.
She'll see you as strong, safe and also sexual... which is a good thing.
The alpha.
Now I'm not going to tell you to go out and start boxing, because you said you already do
What I suggest you do is work a little more at the flirting, the teasing.. keeping her on edge.
It has nothing to do with kindness or such.
And it's not a cruel thing just because they may say so.
Look to their body for clues on whether they like it or not.
A girl saying "Oh, you're mean..." in a flirting tone and with a smile, you shouldn't take that seriously.
She will know, or find out, that you are a strong caring person, which is not bad.
So I suggest, again, work a little more with the tension, suggestions, teasing the girl...
And since you are the leader of men, show it, relax into the position..
Take 30 days to focus on the way you convey yourself through body-language.
Make sure it shows your attributes, both the physical ones, and the mental stability you should have, because if the girl sees you like a leader, relaxed among your friends, strolling nonchalantly up to the bar or wherever she is, turning your head deliberately, noticing her, and whip out an opener.. She will most probably go for it, because of the values you have already conveyed.
From there on out it's just riding the wave and keeping the convo going, dodging shit tests and whatever
So, work on that part,
Body Language, reinforce it,
and
Sexual tension and flirting.