Can You Get an STD If You're Both First-Time Partners?
If neither partner has ever had any sexual contact of any kind with anyone, and neither has an infection from a non-sexual route (like a childhood-acquired oral herpes infection, or a blood-borne route), then no — STDs require an existing infection in at least one partner to transmit; they can't spontaneously appear.
Where this logic can get more complicated
A few STDs and STD-adjacent conditions have non-sexual origins that complicate a strict "never had sex" scenario. Oral herpes (HSV-1) is very often acquired in childhood through non-sexual contact — a relative's kiss, shared utensils — well before any sexual activity, and can later transmit to a partner's genitals through oral sex during a "first" sexual experience. Hepatitis B can spread through non-sexual routes too, including at birth or through blood exposure. This is part of why "we're both virgins" doesn't automatically mean zero possible STD history for either partner — it depends on the full picture, not just sexual history specifically.
The bottom line
If genuinely neither partner has any relevant history — sexual or otherwise — the situation described is about as low-risk as it gets. Testing is still a reasonable, low-cost way to have actual confirmation rather than an assumption, especially before deciding to stop using barrier methods.
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