you are mistaken
sexual desire between a husband and wife is natural and good and has been sanctified doubly, once by nature, and again by the sacramental nature of marriage.
also, why add the qualifier "strong"?
You do understand lust is defined in the Scriptures as a strong desire for something?
epithumeó: desire, lust after
Original Word: ἐπιθυμέω
Part of Speech: Verb
Transliteration: epithumeó
Phonetic Spelling: (ep-ee-thoo-meh'-o)
Short Definition: I long for, covet, lust after
Definition: I long for, covet, lust after, set the heart upon.
1937 epithyméō (from 1909 /epí, "focused on" intensifying 2372 /thymós, "passionate desire") properly, to show focused passion as it aptly builds on (Gk epi, "upon") what a person truly yearns for; to "greatly desire to do or have something 'to long for, to desire very much' " (L & N, 1, 25.12).
Word Origin
from epi and thumos
Definition
desire, lust after
NASB Translation
covet (2), coveted (1), craved (1), desire (1), desired (2), desires (1), gladly (1), long (3), longing (1), lust (2), sets its desire (1).