Matthew Poole and continuators on Job 31:9

9. If mine heart have been deceived by a woman , or if I have laid weight at my neighbours door :

To wit, by a strange Woman, or rather by my Neighbours Wife, as the next words limit it; for of a Maid he spoke before, v. 1. and this cannot be meant of his own Wife. He saith, by a woman; i. e. either by gazing upon her Beauty, so as to be enamoured with it, and to lust after her; or by her perswasions or allurements. Or, concerning a woman, i. e. concerning impure conversation with a forbidden woman. The Phrase is very emphatical, taking from himself and others the vain excuses wherewith men use to palliate their sins, by pretending that they did not design the wickedness, but were meerly drawn in and seduced by the strong inticements and provocations of others. All which Iob supposeth, and yet nevertheless owns the great guilt of such practises even in that case, as well knowing that temptation to sin is no justification of it.

Watching for a fit opportunity to defile his Wife. Compare Prov. 7, 8, 9.