that depends. have you and your boyfriend been living in bubbles for the entire duration of your lives?
we get this question a *lot* and we always answer it the same way. Some STDs aren't spread by sex alone. 1 in 3 people has oral Herpes, and in some cases the oral Herpes can be spread to the genitals.
Just play it safe. Get the condoms, get the dental dams, get the lubricant. Get tested twice a year. This is your life and your health you are dealing with. Don't sell yourself short. Condoms and STD screenings are cheaper than the drugs used to treat STDs and require a whole lot less effort.
Color is for crayons, not for people.