And yet, I feel that I'm a nearly even mix of SX and SP.
In the longer enneagram test that I've taken, I always end up sp/so/sx, which really doesn't make sense to me given the descriptions of the three. I certainly wouldn't rank sx last for me, as a lot of what people are saying about sx in this thread resonates with me (I also agree it should be renamed!!).
So I just took the Variant test, which I'd never done before, and got this -
Sexual |||||||||||||||||||||||| 74%
Social |||||||||||| 38%
Self Preservation ||||||||||||||||||||| 62%
It could just be my mood today, who knows. But I think it's reasonable to say my sx/sp are a pretty even mix, like you. It could also explain why I might leap into things emotionally with others, because I really WANT a deep connection, but then might get scared and for self-preservation sake could then pull back a little.
(From reading enneagram descriptions, I relate most to type 4. However, I think there's a good dose of 1 in me too.)