You should really study up on being honesty. I spoke specifically of sexually transmitted diseases. One partner has to have a disease to spread it. Two disease free MONOGAMOUS individuals have no disease to spread.
Take it up with the Centers for Disease Control (CDC).
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All gay and bisexual men should be tested at least annually for common STDs.
The only way to know your STD status is to get tested (you can search for a testing site). Having an STD (like gonorrhea) makes it easier to get HIV, so it's important to get tested to protect your health and the health of your partner. CDC recommends sexually active gay and bisexual men test for:
•HIV;
•Syphilis;
•Hepatitis B;
•Hepatitis C among gay men born from 1945 to 1965 or with risk behaviors;
•Chlamydia and gonorrhea of the rectum if you’ve had receptive anal sex, or been a “bottom” in the past year;
•Chlamydia and gonorrhea of the penis (urethra) if you have had insertive anal or oral sex in the past year;
•Gonorrhea of the throat if you’ve performed oral sex (i.e., your mouth on your partner’s penis, vagina, or anus) in the past year;
•And sometimes your health care provider may suggest a herpes blood test.
Gay and bisexual men who have multiple or anonymous partners should be screened more frequently for STDs (i.e., at 3-to-6 month intervals). Your healthcare provider can offer you the best care if you discuss your sexual history openly. You should have a provider you are comfortable with. CDC's Lesbian, Gay, Bisexual and Transgender Health Services page will help you find health services that are gay-friendly.
How can I prevent STDs?
For anyone, choosing to be sexually active means you are at risk for STDs. However, there are many things you can do to protect your health. You can learn about how STDs are spread and how you can reduce your risk of getting infected.
Get Vaccinated: Gay, bisexual and other MSM are at greater risk for hepatitis A, hepatitis B, and the human papillomavirus (HPV). For this reason, CDC recommends that you be vaccinated against hepatitis A and hepatitis B. The human papillomavirus (HPV) vaccine is also recommended for men up to age 26.
Be Safer: Getting tested regularly and getting vaccinated are both important, but there are other things you can do to reduce your risk for STDs.
•Get to know someone before having sex with them and talk honestly about STDs and getting tested—before you have sex.
•Use a condom correctly and use one every time you have sex.
•Think twice about mixing alcohol and/or recreational drugs with sex. They can reduce your ability to make good decisions and can lead to risky behavior—like having sex without a condom.
•Limit your number of partners.
You can lower your risk for STDs if you only have sex with one person who only has sex with you."
http://www.cdc.gov/msmhealth/STD.htm
Lower your risk, not totally absolve the risk.