I am not familiar with the term "syphoning" of energy. However, what I do know is that whenever two people, or a person and a member of the animal kingdom come together in close contact, there is a transfer of energy from on to the other. The reason is (1) because our energy make-up is electrical and (2) because the major part of our soul essence/light is outside and extends to about 3ft around our physical bodies. It is believed that the more dominant energy always impact greater on the less dominant. It does not matter whether the most dominant is negative or possitive. The school of thought or advice, particularly in mystical circles, is to stay away from toxic/negative beings, and if you are to be in, really close, or physically intimate with another being, ensure that their energies are as possitive or at least on par with yours..
