Technically everything only exists within our mind at a very high esoteric spiritual level. That said, pansexual spiritual females is quite common. Many of the priestesses of the Goddess spiritualities of prehistory were pansexual I believe. (Bisexuality is included in pansexuality)
Sexuality is so tangled up in our relationships and it is a complex thing involving more than the desire to have sex. If by "spirituality" you mean emotions, friendship, deeper connection etc then of course we can have this with those of the same sex aswell as the opposite.
I think so. I'm a very spiritual person, wich has lead me to being very open and explorative sexually. I think its just sex so what the heck go wild. be safe tho