The breast cancer advocacy groups have been much more organized and vocal than prostate cancer advocates, and money will follow. Also, for the longest time, there has been an implied assumption that because prostate cancer occurs in older men and because old men have heart disease, etc. that they would die with their prostate cancer and not from their prostate cancer in most cases. We know better now because as our nation ages, we have seen an increase focus on addressing ALL potential causes of death in aging males. We're getting better. Five years ago, my father passed away at age 52 from colon cancer.
Family history does make a difference.
Erectile dysfunction is gaining more awareness in the male population. Other treatments include medications injected into penis, vacuum pumps, etc. Not that I am aware of in a healthy gland. It may affect testosterone levels, but should not impact a normal prostate. In people with infections, one thing that doctors do is to mechanically massage the gland to get help with secretions, so in those individuals I believe it makes sense to encourage sex.