if you are a hobbyist you need to get tested or you can find yourself in big trouble with the wifey or gf. there are STD's that have zero symptoms out there but whom your SO will find out about when she goes to her gynecologist.
so you better be getting STD tested atleast every 6 months. you can get it done online anonymously if your county doesn't provide it for cheap/free (many counties these days do not anymore because of govt cuts) this is where I go>> anonymous STD testing>
http://goo.gl/o1Scv6 T34TU2 saves you 10%, the one I get is called the deluxe under STD tests and costs $155 after the coupon