Soldato
Not much of an issue with solid plastic pipe in straight runs, but deffo a consideration with joints or flexi pipe.
You had me a little worried there. My bathroom extractor is mounted directly into the sealing but, if you look in the loft, its connected to solid pipe (like guttering down pipe but grey) and has 2x 45° bend which then vent out the roof tile (1st bend is just above loft floor, goes about 4 feet then 45° bend to take it vertical about 8 feet to the roof tile vent).
I cant say I have noticed any moisture or even dampness around the fan inside the bathroom.
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