Will unpainted plaster become water damaged?

[buhbuh]

We have had our bathroom done recently and the builders plastered one of the walls, then fitted the sink and toilet.

I am now going to paint the walls myself, but I'm concerned about the plaster behind the sink and cistern.

Should I remove the sink and cistern to paint behind?
If I leave those hidden bits of plaster unpainted would they suffer from water damange over time?

(It feels wrong to pay someone to fit a bathroom, then immediately take out the units yourself)

 

[sircerebus666]

Unless you are very vigorous when having a wash then it will be fine to leave them unpainted.

Next time though before the builder (plumber?) fits the units paint the wall it's far far easier then having to do fiddly cutting in around units