My ex-wife had herpes, and I never got it after seven years of marriage (no condoms). If the girl knows the feeling of an outbreak coming and avoids sex, then herpes is not easily spread.
http://www.stdresource.com/concern/c1_d_3_a.php
Specific STD Window Periods
Gonorrhea
The incubation period for Gonorrhea is usually 2 to 7 days.
Chlamydia
The incubation period for Chlamydia is usually 2 to 6 weeks, but can be longer.
Syphilis
The incubation period for Syphilis is usually 10 to 90 days.
HIV
The window period for HIV is usually 2 weeks to 3 months, but could be up to 6 months.
Hepatitis A
The incubation period for Hepatitis A is 15 to 50 days.
Hepatitis B
The incubation period for Hepatitis B is usually 45-180 days, with an average of 60 to 90 days.
Hepatitis C
The incubation period for Hepatitis C ranges from 2 weeks to 6 months - commonly, 6 to 9 weeks.
Talk with your partner about herpes & warts
There are no tests for genital warts and herpes tests are not necessarily useful. Herpes cultures require an active lesion to be present and herpes blood tests do not indicate whether the infection is genital or oral. Most people test positive on herpes blood tests because they were exposed to the virus orally as a child. It is therefore a good idea to discuss these 2 diseases with any new partner. Have you or your partner ever had genital herpes or cold sores on the mouth? Have either of you ever had genital warts diagnosed? Both of these diseases are common and having had either or both should not necessarily interfere with your relationship. Discussing these 2 diseases early in a relationship can reduce the chance of transmission.
Test later
As the incubation period for Chlamydia is up to 6 weeks, you can test at or after 6 weeks from the start of your relationship. It makes sense to test for gonorrhea at the same time. The blood tests - syphilis, HIV and possibly hepatitis - can be taken at 3 months. Most results would show up on an HIV and hepatitis test within 3 months of infection, but these tests can be repeated 6 months into the relationship to fully cover the window period.