I am dating my boyfriend for 4 months now and all of a sudden he became embarrassed when I want to talk about sex. Why is that? Read details please?

We have great sex life and before we used to comment on it now and than. Or even talk about it (who likes what in the other one, etc) all of a sudden he started feeling embarrassed and avoiding topic and directly told me that now he feels embarrassed. How did that happen and why? I like talking these stuffs. Him being embarrassed all of a sudden makes me uncomfortable.
I am dating my boyfriend for 4 months now and all of a sudden he became embarrassed when I want to talk about sex. Why is that? Read details please?
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