striyaṁ rahasi bibhrati
bibharti sadasi striyam
The word mahā-vrata-dharaḥ indicates a brahmacārī who has never fallen down. Lord Śiva is counted among the best of yogīs, yet he embraced his wife in the midst of great saintly persons. Citraketu appreciated how great Lord Śiva was to be unaffected even in that situation. Therefore Citraketu was not an offender; he merely expressed his wonder.