the early songs are all about sex, and love = sex.
eg
yeah, you make me feel, like a virgin, touched for the very first time...
you hold the lock and I hold the key, open your heart to me, darling, Ill give you love if you, you turn the key.
get into the groove, boy you've got to prove your love to me.
experience has made me rich, and now they're after me.
bear in mind that this is being said by a woman whose image is, girl next door makes a huge success. Also, these songs were aimed at teenagers, not mature adults.
the message is clear: active sex life is important, and the more you sleep around, the more boys will fancy you.