Kamasutra 3.4.35

3.4.35

na hi dṛṣṭabhāvā yoṣito deśe kāle ca prayujyamānā vyāvartanta iti vātsyāyanaḥ/ ity ekapuruṣābhiyogāḥ/

At last, when he knows the state of her feelings by her outward manner and conduct towards him at religious ceremonies, marriage ceremonies, fairs, festivals, theatres, public assemblies, and such like occasions, he should begin to enjoy her when she is alone, for Vatsyayana lays it down, that women, when resorted to at proper times and in proper places, do not turn away from their lovers.