Markandeya Purana — Adhyaya 34, Shloka 78
Adhyaya 34 — Madālāsā’s Instruction on Sadācāra (Householder Conduct, Purity, and Daily Rites)
उद्वहेत् पितृमात्रोश्च सप्तमीं पञ्चमीं तथा ।
रक्षेद्दारान् त्यजेद् ईर्ष्यां दिवा च स्वप्नमैथुने ॥
udvahet pitṛmātroś ca saptamīṃ pañcamīṃ tathā / rakṣed dārān tyajed īrṣyāṃ divā ca svapnamaithune
自妻子月经初起之时起算，第五夜与第七夜应当避开夫妻交合；当护持其妻，舍弃嫉妒，并当避免白昼行淫以及于梦中放纵情欲（沉溺于淫欲之梦想）。
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FAQs
Householder life is governed by restraint and care: marital intimacy is regulated by purity-period conventions, and the husband is enjoined to protect his wife, relinquish possessive jealousy, and avoid indulgence that erodes sattva (such as daytime or fantasy-driven sexuality).
This is not a pañcalakṣaṇa topic (sarga/pratisarga/vaṃśa/manvantara/vaṃśānucarita). It belongs to ācāra-dharma instruction, a common ancillary purāṇic function.
Regulating maithuna is presented as conserving vitality and mental clarity; avoiding jealousy and fantasy indicates mastery over rāga-dveṣa so that household life supports, rather than obstructs, inner discipline.