Yeah there have been hints and tidbits about it on past Stern shows. People talk about it here on reddit https://reddit.com/r/howardstern/comments/1fbiw5n/what_is_the_real_story_behind_howard_rebecca_and/

posted 4 months ago in Full House (1987)

He and Rebecca Romijn were swingers with Howard Stern and his wife Beth

posted 4 months ago in Full House (1987)

The porn parody version

posted 4 months ago in Full House (1987)

Your father was a wise man.

posted 4 months ago in Full House (1987)