Arthashastra
त एव अगम्ययोर् अर्ध दण्डाः, तथा प्रतिषिद्ध पुरुष व्यवहारेषु च ॥ इति प्रतिषेधः ।
and the man, at double the above rates. With regard to similar transaction between a man and a woman who cannot mix with each other (agamvayoh), half of the above punishment shall be levied. Similar punishment shall be meted out for any forbidden transaction with any men. . Thus forbidden transactions are dealt with.
english translation
ta eva agamyayor ardha daNDAH, tathA pratiSiddha puruSa vyavahAreSu ca ॥ iti pratiSedhaH ।
hk transliteration by Sanscript