Sexual function is still only partially understood; but there is a lot of progress in the research of this subject. An update on recent research is found on the Sexual Medicine Society web site (LINK HERE). There is an interesting study that shows the benefits of combining Viagra with the new drug PT-141, which is sprayed in the nose. Taken together, they are very effective therapy and may be beneficial for people who do not respond to Viagra alone.
I discussed PT-141 in an early post – it looks very promising for men AND women. Here is a link (LINK HERE) with more information on PT-141, also called bremelanotide.