My boyfriend and I are both virgins and have both tested negatively for stds. Do we still need to use a condom?

Yes! Consult your MD. Condoms are not just for std protection! if one is planning to have intercourse and have no other form of contraception, condoms should be used.Consult your md or family planning clinic .
Yes. Do you want to become a parent? Using birth control pills or other hormonal methods plus a barrier backup like condoms is the best way to not become pregnant.