Lyric discussion by frijolito_ts 

Cover art for Relax lyrics by Frankie Goes to Hollywood

This is easy.

It's a song about semen.

About the importance of holding it in, and of shooting it in the right direction when you, er, "come".

Also, it reminds us that, in order to keep your sexual partner satisfied, it's important to delay one's own pleasure in order for your partner to achieve a higher plane of pleasure.