Thanks for your answer and encouragement!

I read the interview with Dr. Benoff and she mentions that a single
dose was effectively stopping sperm viability after a couple of
hours. But she did not mention the average doseage or lowest doseage
that some guys have had do the job for them.

If you've heard stories of any guys who've had a go with 5mg rather
than the regular 30mg or 60mg I would be happy if you would share.

The XL form seems unnecessary if you take before planned activity,
as the action of the non-extended release form is good for several
hours. The exended release would be best if you could see action any
time of day or night...

I really am not clear what you mean by use as a "shield" and not
a "weapon"?
Do you mean that it should not be relied on as a sole method, or do
you mean that a guy should not change his sexual habits now that he
is empowered?

What is the cheapest source of a S.P.A. that you have found? They
look expensive!