Iam2
In my humble opinion there is yin and yang love. There is yin love based on understanding, very soft light,water, etc. There is Yang love not unlike your father whipping you with a belt or a Zen Monk swatting you during meditation. It is a strong lightning bolt, fire. Both are based on love it is only your understanding of receiving it to see it as a gift or maybe a way to purify yourself.
Yang love, if used the right way, points out your weaknesses, brings negative emotions to the surface allowing you to let them go. Once they are are gone you are much stronger and not attached, a old style teacher could use this the right way.
Learning how to "let go" in an old school way probably the biggest mystery to solve, now there are many technics.
They are opposites that compliment each other. You can find love any place you look if that is your focus. Yin and Yang is a tool to help ones understanding of both sides of the same coin. Once you understand all the inner workings of Love, then you could just say "yeah, it's all love" and you would have all the depth and breadth of that statement.
Jeff