Is Sex On The 1st Date Harmful To Relationships?

A recent study showed that 59% of MEN and 53% of WOMEN expect to have SEX on the 1st or 2nd date.  Although they may be consenting adults, what is the likelihood of that turning into a blossoming relationship or moreso a prosperous MARRIAGE.  STEVE HARVEY suggested to women looking for MARRIAGE to wait at least 90 days before engaging in SEX.  What if the both parties only want SEX, are their any consequences?  MENTAL DIALOGUE asking the questions America's afraid to ask.  ALL I ASK IS THAT YOU THINK