Lost feeling in legs

Snasy

So me and my boyfriend were having really good sex, and I mean so good I came 6 times. (6!) but around the third climax my legs started feeling really tingly and then went completely numb. I could hardly move them and they were twitching like crazy. My boyfriend dismissed it as me just enjoying myself (which I was) and the feeling in them did come back. But I am sort of scared it's a serious thing. Is this normal???