I don’t usually think of the Moon as a sexy planet, but in a woman’s chart, how can it not be tied to sex? The Moon is the mother-child matrix, pregnancy, birth. Women get more horny while they’re ovulating. (One study showed that strippers got the most tips during this part of their cycle!) It’s not a conscious thing, but as there’s a biological imperative to make babies, a women will want to have sex, if only for this reason. (Pleasure be damned!) Mars, of course, is the planet of virility. A man’s Mars would energize or stimulate a woman’s Moon, such that she’d want to carry his baby.
Yet this aspect also contains the seeds of irritability and moodiness. One scenario I imagine is a woman who needs to be nurtured or cared for, while her guy is being brash and selfish, not being sensitive or attuned to her emotional needs. (Of course, the sign placement will modulate the expression of the Moon and Mars in their respective charts.)
Another expression of this “meeting” is that the man will be protective of the woman (using aggression, if necessary). From the perspective of evolutionary biology, if she is indeed carrying his child, it is in his self-interest to make sure the baby survives, because he wants to increase his chances of passing on his genetic material.
Comment below: Do you have Moon-Mars natally or in synastry? How does this aspect play out in your life or relationship?