Tantra and energy stealing

Hello,

In Tantrism both Hinduist and Buddhist and even in Taoism, they say that with ejacultion a man lose his vital energy. Tantra say that some man with an esoteirc technique can take some of the energy of his wife (yin energy to replenish the yang energy) in a invisible form by act of concentration. ANd can somebody take the energy of someone else from distance by the mean of trataka? I dont ask to do it but just to be aware of the phenomena.