Kamasutra
युक्तयन्त्रायाः स्तनान्तरेऽपहस्तकेन प्रहरेत् ॥ ११ ॥
When the instrument penetrates her as she is lying on her back, the space between the breasts should be struck with the side of the hand.
english translation
अपहस्तक प्रहारचित लेटकर समागम कराती हुई स्त्री के स्तनों के मध्य में हथेली के पिछले भाग से प्रहार करना चाहिये ॥ ११ ॥
hindi translation
yuktayantrAyAH stanAntare'pahastakena praharet ॥ 11 ॥
hk transliteration by Sanscript