Forget phone sex. If you're looking to procreate find a man who doesn't have a BlackBerry attached to his ear.
New research conducted by the Cleveland Clinic found a connection between guys who spent hours on their cell phones and poor sperm quality.
A Reuters article  about the study of 361 men said:
In general, the researchers found, sperm count and sperm quality tended to decline as daily cell phone hours increased. Men who said they used their phones for more than four hours each day had the lowest average sperm count and the fewest normal, viable sperm.
So if you are going to talk dirty, take precautions and use a land line.