It’s a song about a couple making love while an atomic bomb drops. This was typical subject matter for the band Modern English, who were a essentially a goth tinged post-punk band. Except when they went to record it, something went very different for them and the result was an upbeat sounding pop song that despite the dark subject matter manage to become on enduring classic iconic hit of the 80s.
It inspired many sales and interest in the bands album After the Snow unfortunately they other songs on the album matched the pop hit potential of their one and only hit song
I Melt With You