Because of that, many of us come to expect that intense feeling to remain throughout the relationship.
But this, say experts, is a false expectation that frequently drives many a couple apart.
So how do you keep yourself from expecting too much too soon?
How do you know when to hold on and when to let go?
Experts say it all boils down to just a few old fashioned bylaws of romance: seem a bit conventional, experts say one of the best ways to win at love is to hold off physical intimacy until you really get to know someone.
"Sex changes everything," says relationship coach and matchmaker Melissa Darnay.
The end result, she says is that one partner is playing by one set of relationship rules, while the other may not even be on the game board.
But as sound as this tenet may be, it also underscores what experts see as a major problem in relationships today: We frequently expect a little too much, a little too soon. "People want to rush into a relationship and they want it all to work out right away.
They become very concerned if the other person doesn't call them quickly or doesn't want to see them with increasing frequency," says Jo Ann White, a relationship expert and psychology instructor at Temple University in Philadelphia. Many times, she says, one partner simply doesn't want to move that fast.
When partners place at least some responsibility for the success of the relationship on themselves, Lowe tells Web MD they ultimately will get more from each other.
There is perhaps nothing quite as exhilarating as the heady feeling of falling deeply, madly, passionately in love.
To avoid all these complications, Darnay advises both male and female clients to keep things light and breezy -- and put no expectations on each other -- for at least a few months.