To put on a condom, the man has to be sexually aroused. It is well known that sexual arousal, especially among men, is a proximate occasion, if not of sin, then at any rate of foolishness.

In that respect, the female condom (Reality, etc.) has a lot to be said for it. It can be installed in advance, lessening the nuisance & thus increasing the likelihood that it will be used. On top of that, it puts control in the hands of the partner who is at greater risk.