Everytime I touch you, you're just travelling south

The story:

I thought it was some weird reference to oral sex to be honest, but I had an inkling that it might be wrong because no one's that egocentric, surely. Sang it loudly to my mum in the car, she thought it very funny, especially when I explained to her exactly what travelling south meant to me and my slightly overactive imagination. Real lyric's not much better though, maybe the subject of the song is shuddering with revulsion? We'll never know.