I think you have a very limited understanding of sexual attraction... it is not static. It can grow for someone as you get to know them and spend time with someone.
It's always interesting to watch my attraction for someone who was really hot up front start to slide down the more they talk, or the other way around. Personality is so much more important than level of initial attraction.
Raw sexual attraction is instant and involuntary, not cerebral, cultivated. It doesn't depend on anything other than a person's biology. Looks, smell, maybe other biological factors that are hard to quantify. If a woman is with you for other reasons, then she's just not into you sexually and you're playing a game in nightmare mode if you're trying to establish an LTR with an attractive female that has other opportunities or keep it going without issues (e.g. cheating). That does not mean that other slow-burn factors such as intellectual chemistry or friendship do not apply, but it does mean that they work synergistically and on top of the raw animalistic part which is the foundation.
This is all based on decades of empirical observations. On the plus side for men, it is definitely possible to learn to detect this extremely reliable indicator. On the minus side, one needs a lot of experience with many different women, which isn't the case with average, physically unattractive males.
