Like can it keep him from expressing his masculine qualities to their fullest extent. I have Mars in Pisces and I wish I had Mars in Aries or something like that. How can I get the most out of my Mars energy, it seems like there's something inhibiting it's full expression. For example, I want to be more aggressive in general.
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Mars in Pisces is considered weak and it leads to a man feeling less manly even though it's possibly just in his mind.
It indicates some sort of problem with the father that may have left a trauma to the native. Like father being absent (literally or not) or making the child feel less of man in someway by subotaging it.
It tends to be a people pleaser placement, having difficulty to say "No" even when he doesn't want to do something.
Must be carefull because it also indicates drug/alcohol/sex addiction.
Gives creative tedencies and it's more of a softy.
In your case your Mars receives a square from Saturn which is harsh for that poor Piscean Mars. Holding anger and being more passive is indicated for sure by Mars in Pisces or Mars in hard aspect to Neptune.. Saturn in hard aspect to Mars often indicates these qualities too though.
However I hope Saturn grounds your Piscean Mars even by blocking it. It may save you from a lot of reckless and self-destructive tendencies hopefully.
Saturn-Mars may bring a bit of difficulty in sexual matters by making the native a late bloomer. It may indicate sexual problems like not having fun in sex or being very nervous because you may not feel good enough etc. Usually (as with most Saturn hard aspects) having partners that somehow make you feel bad about yourself (not a good enough body/bad perfomance in sex) is very common. However I've seen that sex with these natives gets better and better with age especially at Saturn's age which is around 30-35 yo.
I find it funny how Mars-Neptune men want to be more aggressive. It's so adorable and you probably hate being called adorable/cute but for most women it's the best way to make them weak in the knees.
A Neptunian Mars gives some kind of feminity which makes the native look more masculine in a magic way like when we add salt to the sweets in order to make their sweetness even more intense. Just bexause you are not like an angry/rude/muscular gorilla doesn't make you less of a man.
The only thing your have to learn is to say No and insist when you don't want something instead of accepting it and accusing others for making you doing it.