As often as the Princess engages in lewd and erotic acts, she's always had a problem with 'longevity.' Sure it's fine when doing so with the odd butler or several maids at once. They're paid not to judge her! But it's just so darn embarrassing when her tiny panda friend outlasts her by orders of magnitude. His stamina seems boundless, truly fitting of his status as a hero, of which he assures her he is definitely not exaggerating. Definitely.
Thankfully the Princess discovered Normla through the little bear, this pink-haired, effeminate fellow was always more than happy to provide advice and vital training regimines to help boost the Princesses' stamina. Though early results are less than promising, the Princess has no doubt about the efficacy of such exercises.
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Author's Note: You definitely should not trust alien sociopaths. Not that I bring that up for any particular reason. It's definitely not applicable to this situation.