The dominant culture is insistent that sexual freedom be glorified, and anything that hints at moral disapproval of sleeping with whomever whenever one gets the urge must be quashed.
That people sinned in the past is no shocking news. From a health standpoint the fact that people have been involved in pre-marital sex has no bearing on the very real dangers. From a spiritual standpoint the fact that people have and do sin has no bearing on the fact that it's still wrong.
Preach on brother, preach on.