Hi there,
What kind of tests u done?
(HSV, Chlamydia, Syphilis, Gonorrhea (this is tested by urine tests), Trichomoniasis (swab tests) )

Basically HSV1 and HSV2 is same, just one of them like to live in your mouth, and other choose to stay down. And HSV is normally prominent (meaning u will see the symptoms unlike Chlamydia,Syphilis and Gonorrhea that u may not know if you are infected because they don't show up).

If you have done all and results negative, then you're like me. Are u circumcised? Try to wash frequently and use very mild type of soap. Best to ensure it is clean each time u take a pee, it improve the condition (at least for me).

Best is to have a urologist to check on it.

i would not recommend to kiss if your partner or you are having an outbreak (herpes). Other that than its okay to kiss.

bacterial infection for female i think is quite common, so have to maintain good hygiene.
Yup always dry it up after washing.

kinda strange, how come both of u do regular blood test every 3 months? always change partner?? 

yes, some ppl have red rashes (some kind of bad bacteria on the skin)  especially if uncircumcised or near 30s.
just dry it up after every wash enuff edi.

std not a concern, hiv is.
stay safe