I don't see that much problem here. Just compare it to a Kalachakra initiation:"The three exalted initiations are as follows: the vase initiation is the gnosis of bliss and emptiness that arises from the disciple touching the consort's breasts. The secret initiation is the gnosis of bliss and emptiness that arises from the disciple savouring the bodhichitta
(sperm), the wisdom-gnosis initiation is the experience of connate joy that arises from the disciple and consort themselves engaging in union."
"If the Buddha-Nature is seen, there will be no seeing of a nature in any thing."
(Nirvana Sutra, T12n374p521b3; tr. Yamamoto)
"Neither cultivation nor seated meditation — this is the pure Chan of Tathagata."
(Mazu Daoyi, X1321p3b23; tr. Jinhua Jia)
"With sudden enlightenment to Tathagata Chan,
The six paramitas and myriad means are complete within that essence."
(Yongjia Xuanjue, T2014p395c14; tr. from "The Sword of Wisdom")