How can I get my boyfriend to stop pressuring me for unprotected ?

Last Friday I suggested we get tested together for STDs, HIV, etc. The results came back negative and everything was fine. That night though I slept over and we fooled around a bit but he was really insistent on us having unprotected , which he referred to as "pure ". I was pretty clear that seeing how we just got into a relationship in late January I am in no way interested in unsafe . We moved this along pretty fast and it feels a little too fast in some ways.