I personally know what You mean.. I've never as easily gotten a crush on a
"vixen"/modelesque girl as those with "cute" features.
For "sudden sex" on the other hand, I'd fuck a model anytime

, unless I'm in a
relationship.
But.. I guess there are those who have a preference for modelesque girls for
romance, as well those who have one for cute girls for sex - individual differences.
Obviously the term "cute" works where it's used among what we sell so I don't
see a need to rephrase... could be worth experimenting with though?
If so, the question remains: what other terms could we use?