Generally, Mars in the 8H points to someone who has a very strong drive to "bond" with people, especially on a sexual / intimate level. Yours being in Pisces makes you emotional and intuitive, probably very sexual and always looking for intensity in your interactions, especially with the opposite sex. This position can also have extremist traits, like you don't do things half-way, and if you want something really badly, you'll overextend yourself to get it. However Pisces isn't a very "active" sign in and of itself, so the drive/ambition may be more dormant and "quiet".
Your actions are probably much more effective and powerful if they come from instinct/feeling rather than reason or logic.
There could be issues with shared resources or conflicts in sexual relationships related to the level of intimacy and money.
Given that your Mars has supportive aspects, you are probably a receptive lover with a romantic and idealistic side.