I've been polyamorous since my teens. I've been in monogamous relationships too, I'm just happier in poly ones. I won't be involved in any sort of infidelity, and I'm not interested in "hook ups," thanks. I prefer to develop relationships with people with whom I can be friends and possibly more. Friends are great!
Lately my Myers-Briggs type seems to be INTx. The "x" means I'm balanced between the "J" (judging) and "P" (perceiving) types. I'm very close to being balanced on the N/S (intuitive/sensing) and T/F (thinking/feeling) scales, but firmly introverted. There's been some media buzz lately saying that the MBTI is "astrology for nerds," and at least one article mentioned that the Big Five scale IS scientifically validated, so I tried it. On that, I'm an O65 (relatively open to new experiences), C79 (well-organized and reliable), E53 (neither particularly social nor reserved), A90 (good-natured, courteous, and agreeable), and N14 (remain calm even in tense situations).