Stranger Than Kindness (Nick Cave cover)

It's about sex, the song suggests that sex is 'stranger than kindness'

kindness is strange because its other people doing nice things for you for no personal gain what so ever which if you have trouble trusting others can seem like a very strange action

sex is strange like kindness its again people giving themselves up to others she cant imagine someone would offer their body to her hence making the experience strange like kindness