Shiva Purana
रात्रौ व्यवायः कर्तव्यो न दिवेति श्रुतिर्जगौ॥ दिवासंगे महान्दोषो निन्दा चापि दुरासदा ॥ २३ ॥
“It is mentioned in the Vedas that sexual intercourse shall be indulged in at night; not during the day. There is great harm in having sexual intercourse during the day time. It is censured.
english translation
rAtrau vyavAyaH kartavyo na diveti zrutirjagau॥ divAsaMge mahAndoSo nindA cApi durAsadA ॥ 23 ॥
hk transliteration by Sanscript