I don't buy romance novels either. But I do like to see heroes with foibles, strong yet vulnerable. I like to see strong women, too; interesting female characters who think about something other than a man. I like complicated, sciency plots but also strong characterisation. I'm not too keen on violence or gore; I prefer more psychological horror.
You can write an excellent SF story with these characteristics which will appeal to BOTH women and men.
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You can write an excellent SF story with these characteristics which will appeal to BOTH women and men.