Here's a look at some of the top health news being talked about around the U.S. and the world today:

• Staying in good health could help prolong a person's sex life by as much as 15 years, according to new study published in the journal BMJ. As recounted on the Web site WebMD.com, researchers calculated average human sexual life expectancies and found those who said they were in good health were nearly twice as likely to be interested in sex in mid- and later-life.

• U.S. health officials said genital herpes is a big problem in the U.S., with about 16 percent of those between the ages of 16 and 49 infected, Reuters reported.

• Kidney donors appear to have a similar life expectancy as non-kidney donors if they survive an initial riskier period, researchers said this week in a Time article.

• Focusing vaccination efforts on kids - who tend to pass the most germs within most communities - appears to be an effective way to help curb transmission of illness, according to a new study reported by the Los Angeles Times.

Tina Reed covers health and the environment for AnnArbor.com. You can reach her at tinareed@annarbor.com, call her at 734-623-2535 or find her on Twitter @TreedinAA.