Only if you leave it somewhere far to damp.
Wood is hydroscopic which means it contains water and can readily absorb more water, it can also release water and it will continue to do this . A stripped guitar may expand and contract slightly more than a completely finished one but generally this is not a problem on electrics. It can be a problem on acoustics and in some climates cause them to need a summer and winter saddle to account for the fact the guitar plays differently at different times of the year.
I think it was john lennon who completey stripped an epiphone casino and then told everyone how much better it sounded - sometimes guitars do sound a bit more 'woody' with no finish, sometimes it makes very little difference at all.
An electric will survive quite nicely without finish for a long time, but it will get very dirty and grimy since it has no protection - look at the rory gallager strats!
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