I beg to differ, at some point it just comes off as weird. Like we get the point, especially when it's moving the plot and adding an element to the characters, but when it's just shoved in your face 24/7 it gets weird. I really didn't need to see a horse take his schlong out.
This might be a false equivalence, but I'll try and explain where I'm coming from. People jerk off all the time, now imagine a mangaka dedicates panels to a character pleasuring themselves every few chapters. Unnecessary.