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In a review of historic opposition to contraception in the face of President Obama's directive that (virtually) all employee healthcare plans fund contraception for women the way they fund Viagra and Cialis for men E.J. Graff first reviews the biggest standard, historic objection to contraception

Late-19th- and early-20th-century pundits said that the nation would become a bordello if anyone could have sex without consequences and warned of the death of the American family.

Source: TAPPED

And finds it wanting (emphasis mine)

In other words, women can work for Catholic hospitals, colleges, social-services groups, and so on—and still have the same rights to sexual health coverage as men, under the same plans. All that Viagra needn't lead to either 19 children and counting; to abortions; or to impoverished women.

Ouch!

The Viagra-but-no-pill argument actually cuts two ways with hidebound institutions such as the Catholic and many Protestant churches. Their argument against contraception is that it interferes with women's "natural and normal" functioning, and thus constitutes an unnatural intervention in human reproduction.

The problem, of course, is that even if one were to argue (as the Catholic hierarchy in fact still does) that "virtuous" men could use Viagra "only" for reproduction there's the issue of the Church's ban on other forms of "unnatural intervention" like in-vitro and artificial insemnation. Sort of by-definition if a guy can't get a woodie without medication then "nature" has decreed he should do without.

And yet to the very best of my knowledge there is no Church doctrine forbidding its employee insurance plans from covering, or indeed its healthcare facilities from dispensing, Viagra or Cialis.

But I digress...

At the end of the day, neither Viagra or Cialis have created catastrophic baby booms, orgy outbreaks, upticks in divorce, or any of the other bugaboos projected by opponents of contraception. Certainly not among the kind of people willing to become employees of the Church.

Therefore prior evidence suggests that contraception availability will also not produce similar licentiousness.  Nor, as we have seen, above, is contraception any more of an "unnatural intervention" in fertility than is Viagra or Cialis.  Both claims, therefore, are red herrings.  There may be <em>some</em> legitimate reason that conservatives object to giving women control over their own fertility.  But if so they don't seem very comfortable saying it.  Thus the prevarication.