Welll....I'm a dude and I have to say, I've never been into harem stories. In my opinion they are some of the most, unrealistic and misogynistic stories ever.
And I also don't believe a female main character has to beat down all the male characters for herself to be a good character. I also think it's kinda close minded to assume that the only way a guy will pay attention to a female lead is if she gets into lesbian situations.
I think you should reevaluate some of your ideas on "what male readers" want. It feels like your ideas are more in line with corporate or mainstream media, but far from the nuances of actual people.
As far as the characters themselves, I don't really have an opinion any which way. The male and female look so alike, they don't really give me anything to work with mentally. I think they're designs could be a little more creative over all. Right now the body suits look pretty generic, and their silhouettes aren't special either. I will say, they are well drawn, but I probably won't remember either of them after looking away for 5 minutes.