We tried to abstain for 3-4 days before a S/A but also made sure that we were helping keep production up all month long. In other words you will have better results if your partner is having frequent ejaculations the whole month through (1-2 per week we tried to average, more if we were in the mood).

In May we did an SPA test (sperm penetration assay) which they do a basic S/A with as well. We BD on the 14th, abstained for 4 days and did the test on the 18th and then BD again for the next 4 days and I ovulated on the 5th day. We got pg this same cycle.

Sperm Penetration Assay links

http://www.regence.com/trgmedpol/lab/lab11.html

http://www.infertility-male.com/labtest/spabackground.htm