I'm back again... Sorry for all these time I've been away...
Well, Liam, don't worry, I'm back again to support Catherine!

I do think that the lady we are discussing did not lie. Education for a Catholic princess in Spain was really very much oriented to create some kind of manipulated character. A Spanish Infanta was bound to obey and serve her father, her husband and her son, in that order, through their whole lives. A big sense of culpability was impressed in their minds so that there could not be even a small doubt about their righteousness and chastity. Catherine was fanatically devout during her whole life and she gave many proofs of it. She did disobey her husband but that was just because she thought that, doubting about her virginity and intentions when marrying Henry, people were not only insulting her and her beloved daughter, but also her beloved parents and acestors memory...
And yes, what could have stopped Catherine and Arthur to consummate their marriage. She certainly was a robust girl and Arthur could have been so... (about all those people saying how well made and strong he was could just be a means of flattery, couldn't it?). Then, why do I think they didn't do it? Well, in first place I don't think Arthur was a strong child (I think it was the Spanish ambassador who said he looked a bit like Catherine's brother prince Juan; like if he was constantly ill...). And then many people don't succeed on their first relationship to consummate anything properly. A clear example: the future King Fernando VII of Spain couldn't consummate his first marriage with Maria Antonia of the Two Sicilies until the first year had passed. And he was certainly a robust young man of 18 who would prove very satisfied with what he had just discovered after managing to loose his virginity. What had happened during that long year?? He had wasted his time touching his wife's breasts... It could be very possible that Catherine and Arthur experienced something similar... Why not??
About Catherine and the Spanish kings ambitions towards the English friendship. It's true, it could all have been a strategy to mantain the alliance. But then, why was Elvira de Toledo so sure about Catherine's virginity in the first days after her marriage?? Why didn't Catherine, once recovered from her illness, wait a couple of weeks to see if she had been left pregnant? Her own sister-in-law archduchess Margaret had gone through the same situation (a short lived marriage with a sickly - here I'm again assuming that Arthur was weak - but spirited husband) and had been left a pregnant widow. Instead of that, from the first moment both Catherine and her duenna insisted that Arthur had left her ''as pure as she had been born''.
Of course, all of that is nothing else than my own personal opinion --- and my support to Liam, of course!