It's inconsistent, you would need easy & cheap at home sperm count testing to be reliable, like we have with pregnancy tests.

With other forms you can see results via period activity reduction or increasing (in case of copper IUD) or physical breakage or feeling changes.

I wonder if the jacuzzi people love or hate this.

Make sure to recruit Olivia Wilde née Cockburn for the advertising

An hour for 3 weeks, what the hell.