My long distance bf has high libido

As the title says, my long distance bf has high libido. He'd turn our conversations almost always intimate. As someone with low libido, I sometimes feel overwhelmed and pressured to keep up with it; to help him with it by sending him photos per his request.

Now lately, he's been asking me to do it over video calls. And I'm not sure how I feel about that. I'm confused. I feel his sexual frustration from our long distance situation.

What can I do?