Just one thing, I think these videos should make a point to separate love from lust. The body responds to sexual desire in particular ways no matter what the feelings are for the person. So, when they call physical reactions to feelings the science of "love", it's not entirely accurate. In some cases, it sounds as if they are prescribing how love should feel rather than assessing how people actually feel. I think it's better to ask someone how they feel, rather than make a generalization about how everyone feels universally.