Shiva Purana

siva.sh/siva-purana/rudra-samhita/143/11

संतु नार्यः सहस्राणि रूपलावण्यभूमयः ।। परं निधुवने काले ह्यैकेवेहोपयुज्यते ।। ११ ।।

sanskrit

There may be a thousand damsels of exquisite beauty and comely features. But only one of them can be used at a time for the sexual intercourse.

english translation

saMtu nAryaH sahasrANi rUpalAvaNyabhUmayaH || paraM nidhuvane kAle hyaikevehopayujyate || 11 ||

hk transliteration by Sanscript