Hot stuff under chilly circumstances

Have you ever wondered why are those reality shows like Temptation Island, Survival, Love Hotel (?) etc. always recorded on some exotic islands with the hot climate, under the palm trees and turquoise color of the sea? I mean, why do we, as human beings, connect love and passion with sunny beaches, palm trees and hot bikinis? Why not shooting this kind of programmes in Siberia, Greenland or Northern Sweden? I am sure some sweet lovin’ could be brought to life also there… That could be so “hot".