Believing that Viagra, the new pill for male impotence, will solve the sexual problems of most couples is somewhat akin to believing in the perfect orgasm, sex therapists say.

In fact, although Viagra will restore sexual vigor for uncounted couples, it may actually cause some relationships to expire.

Overall, the effects of Viagra will be dramatic. The drug could have one of the biggest impacts on America's sex life since the birth control pill, says pioneering sex therapist David Schnarch. "It is a bold statement to make, but it is certainly in the ballpark. Viagra will have a profound impact."