That depends on how the word kundalini is defined. The basic life force kundalini is in the tailbone. But if you mean the sexual aspect of kundalini, it is surcharged from the perineum area by gross and subtle sexual energy.
Even though initially, raising of kundalini is done by the help of the sexual aspect of it, ultimately it is the aspect at the base chakra muladhara which must be curbed, because even though that is not as sensational, it is the root element (bija) or mula. In fact the sexual aspect will always enslave us if we do not get the root aspect under full control.
After a yogi achieves what is called urdhva reta, he gets the authority to approach and fully subdue muladhara. So long as muladhara is not understood and so long as we remain hog-tied to the sexual aspect and see it as everything, we will always be forced under the subjugation of kundalini.
Enjoying kundalini by manipulating the sexual aspect of it, is not the same as full control of it to be a siddha.
Books like Hatha Yoga Pradipika establish Muladhara as root chakras, so if one feels that kundalini is rooted in perineum, it means that one is identifying kundalini as sexual potency. That is okay. But the definition from Yogic Tradition only places sexual potency as an aspect of kundalini which is curbed by brahmacharya practices in yoga kriyas.
So I think that for a balanced discussion kundalini has to be defined. We don't have to accept anybody's definition but at least we have to explain what we mean by kundalini and then the discusssion can be clear to each party.