You have to kill to get stronger because you eat them. Thats why the sacrifice the kobolds make for you is just a bunch of food. Secondly the whole strength from ejaculation thing makes little sense to me. I mean maybe if they wanted to make jokes and jerking off was a part of the game then i could see it but not from sex. Maybe your thighs would become stronger from thrusting but i doubt it. Im not saying i wouldnt like to see this in the game tho it would be kinda cool but it doesnt make much sense and i feel like you have to sacrifice something and doing this would remove that
I see the points your making and they are very well made points, but, maybe 4MM can make it another mode where you can kill to get stronger but you can also grow stronger by ejaculating, and as I stated in my first comment, it was only suggestions, and going with your stronger thighs point, that could be good, because if you have stronger thighs then if your wings get punctured while trying to take the capital then with stronger thighs you can bust down the gate because you can put more force into your legs