Why does my boyfriend just want to cuddle and spoon sometimes instead of sex?

We're both 20 and been together for over a year now. I'm more experienced in relationships than him (I'm his first real girlfriend), and the only girl he's ever kissed let alone anything else.

We had sex for the first time a while back. It was amazing and he seemed to really enjoy his first time. But its strange that sometimes he's just as happy cuddling without needing to go further and make love. When I offer to have sex sometimes he says he just really likes the feeling of wrapping me in his arms and protecting me without going further.

I playfully tease him about it but he says that he just likes the feeling of me next to him.

Do you think it's strange for a guy to be like this? Should I be concerned in any way?