Many young career minded people don't but still want a physical
relationship <http://romanticaffairs.tripod.com/Intimatedating.htm> ,
many of these need sexual encounters
<http://romanticaffairs.tripod.com/1-nightstandluv.htm> but without the
frustrating
attachment of a boyfriend or girlfriend.
This means they have time to concentrate on their profession/career and
not worry about what is going on at home, as essentially they are
single.