Well, I mean, we need to be careful, since some people use "desire" as attraction, some use it as lust, and the scriptural epithumeo is translated as both desire and lust but is definitely stronger than "attraction" since Our Lord says it's very bad, so here it is perhaps safest to specifically state it as lust vs attraction to be clearest and avoid desire. Anyway, in the "popular" presentation of temptation and stuff, attraction is then what assaults you, and you're not blameless when you entertain the attack, but it's really only a "sin" at the consent stage (the next one down the line). You don't have these logismoi floating around before the Fall, either heterosexual or homosexual. In St Augustine's account, if I recall, sexual intercourse before the Fall (he believes in sex before the Fall) is governed entirely by our reason without any of this attraction business entering into it.