I try to create a balanced team because of attract. That is, I generally try to have equal numbers of male and female Pokemon. In recent years, though, I have discarded that because of statistical considerations. My HG team only had one female Pokemon on it, and my BW2 team has none. In fairness, my BW2 team consists largely of Pokmeon with substantially male gender ratios, one member is Male only (braviary), and one member is a gift Pokemon who is always male.
On a personal level, I don't care about the sex of a Pokemon. As a competitive player, I worry about infatuation.