Lost City

According to the results of last week's poll, 83.5% of us were fans of Amanda and got curious about Sanctuary because of her, 12.4% haven't seen Sanctuary, and 4.1% liked Sanctuary and at first were interested in Amanda because of the show :)
The new poll is a Sam/Jack poll. Long time ago, we had a poll if the rules and regulations were the only thing standing between Sam and Jack in the first 8 seasons of SG-1, and a little over half of us voted "No". So what was it? What kept them apart? I tried to think of a few reasons to give as options for an answer, but you can also answer "other" and explain in comment. Oh, and you don't have to pick just one answer.
What kept Sam and Jack apart in the first 8 seasons of SG-1?
The rules and regulations
73(37.4%)
Things that happened to him/her in the past
7(3.6%)
Their sense of duty
64(32.8%)
Feelings they had for other people (now or in the past)
7(3.6%)
Their friendship
21(10.8%)
He/she wasn't ready for this kind of a relationship
19(9.7%)
Other
4(2.1%)
