I suppose Roddenberry thought that male and female transferred to the immaterial world, too, to energy beings. It was very sixties. Theyt might be both male and female or neither or they may choose, like transexuals do, or they may be male one day, female the next. Or maybe they just love each other. Kirk does seem do contradict himself, cos he says love doesn't matter on the physical form, then he says the companion and the man can't experience total love unless they are both the same. Maybe he just meant total love. That speech by Shatner is shatner at his best! It's so 60's! 'You can't feel, you can't join, you can't....love!!'