Reaching orgasm

So I’ve been with my boyfriend for a few months now and when we started having sex I never thought I’d orgasm. I couldn’t even really feel anything he was doing down there. Now everything he does is electric and I’ve actually reached orgasm just through penetration. My old tried and true vibrators aren’t really working anymore- I just want him. Is this normal? Has anyone else experienced this? Do you know how/why something changed? It just doesn’t make sense to me.