mars is the ruler of aries and scorpio so passion incinerates in both these signs, aries is the masculine expression of mars so this passion can be more externalised, focused on external pursuits, interests, lovers, meaning etc, destructive in the outside world, sex is an energetic, passionate outlet, Scorpio is the feminine expression of Mars, this can be more internalised, internally destructive, passions welling from deep in the unconscious and directed through spiritual desire, sex is passion from the soul desiring infinite union