Why does he shake?

When I kiss my boyfriend he shakes. I don’t know what part of him trembles, but I can feel it against me. I’m worried.
It puts me off kissing him because I think it hurts him. It can’t be a nice feeling for him either.
Why is he shaking?

oh trust me I have had this guy before that if we would kiss or do anything more than that s*x or just anything he would shake and I just think its so cute and it was because everything just felt so good to him and he couldnt hold it just kissing him felt really nice

ask your boyfriend why he does it

I would ask him but I feel embarrassed...
how could I just come out with it...
"Babe, why do you shake when I kiss you?"

Personally - I think he's just nervous,though something like this may be new to him.I don't know what this kid's situation is -Dating wise and all,(If he's ever been kissed,Had a Girlfriend).

I highly doubt it's something against you.Of course not!He may just be nervous.Nothing to worry about.He'll loosen up as time goes on,and when the relationship gets stronger.

WELL YOU JUST NEED TO ASK HIM WHY HE SHAKES, BUT HE MAY BE SHAKING BECAUSE YOUR SWEET KISSES MAKES HIM SHAKE OR IT IS NEW TO HIM

my boy shakes too. and I asked him. he said its a mixture between nerves and pleaure. its so normal. and it is also a sign that he loves you. lol but really. its normal no need to ask. unless hes fomaing at the mouth and growing green spots. thats when you should be alarmed. lol