Oil and lube might destroy your condom
We learned in the Guide to Getting It On in 2009 not to use petroleum-based products (baby or mineral oil, lotions or Vaseline) with latex condoms because THEY WILL DISSOLVE THE LATEX! As of this writing, polyurethane condoms are safe with oil-based lubes.
Don't get jizz in your eyes
It hurts! Also, you can contract chlamydia, gonorrhea, hep B, herpes, syphilis, HIV, and HIV. So.... don't.
Novelty items are for gags
If you bought it at the mall, it’s probably not meant for sex. “Motion Lotion," “Spanish Fly,” and anything listed as an “edible cream,” is not meant to go inside of a vagina. Sugar or synthetic sweeteners can lead to yeast infections and other complications. Be an intrepid consumer: double-check these products before you buy them! New brands for lubricant come and go quite often, but I stand by JO brand, ID, and Pjur, water-based and silicone.
Your antibiotic might get you pregnant
Well, kind of. If you are prescribed a Rifampicin-type antibiotic, it will make your oral contraceptive less effective. Check with your doctor if you have any concerns about compatibility of medications.
Sex is not baseball
Unless you’re playing the world’s most boring sport, steps do not need to occur in order by following first, second, and third base. Mix it up! Run a zigzag around that field.
Penetration isn't required
You heard me. Lots of same-sex couples never utilize penetration at all, and have plenty of orgasms. If there’s one question that lesbians are probably sick of hearing, it’s “How do you have sex?” Just so you know, tribation feels amazing.