Shower sex can be hard, you and your partner could be different heights, you can slip and fall and have all kinds of troubles. There's a hand bar, and step you can get for the shower to help you if you ever wanted to try.
Personally to me, I do not like shower sex for the reason it causes my vagina to be kind of dry and my husband is taller than me and I'm only 4'11 so his penis touches to my back and when I bend over he hits the top of my butt crack and my cheek bone so we end up having to have me bend over and stand on my tippie toes and half way bent so we can do it.
In the bathtub it is a major issue unless we go doggie. If he lays down then I cannot fit my legs beside him but if I want to do it bad enough then we will but I tend to lay him on the bathroom floor and ride him like there is no tomorrow.
We enjoy using waterproof toys for when we are horny in the bathroom just because it kind of is trouble for us in the tub and sometimes we just want to have some spontaneous fun and tease until we get back to the room and just go at it.
If you do have a walk in shower it may be easier but if you have a tub shower then good luck to you and if it works for you then have fun.
You may end up needing some lube the water feeling in the vagina may dry you out but I'm sure if you use waterbased lube or petroleum jelly, or even waterproof lube you will be fine since it really does not come off.
