There have been numerous discussions on these topics, try a search on the various boards.  If you understand scientific references, a good starting point is the CDC website; STD's are a world-wide topic.

Life is a terminal illness; you cannot escape alive.  Of course, there is a lot of fun to have before feeding the worms; talk to your partner(s) and find a comfortable level for all of those involved.

Medical advice is available but not for free.  Have fun, play safe.

DrX