Brihajjataka 4.1

4.1

kuja indu hetuḥ pratimāsam ārtavaṃ gate tu pīḍa ṛkṣam anuṣṇa didhitau/
ato anyathāsthe śubha puṃ graha īkṣite nareṇa saṃyogam upaiti kāminī//(vaṃśastha)

Mars and the Moon are the cause of the monthly menses; but when the non-hot-rayed [Moon] has entered an afflicted sign, / if it is situated otherwise and aspected by a benefic masculine planet, the passionate woman enters into union with a man.