Distant spread of cancer occurs when malignant cells become detached from the original (primary) tumour, get carried to other parts of the body through the blood or lymphatic vessels, and establish themselves in the new site as an independent (secondary) cancer. A tumour that has spread in this manner is said to have metastasized.
Wanaume wengi na wanawake hupiga punyeto maishani mwao, kwa sababu huwafanya wakajisikia vizuri na huondoa dhiki za mihemko ya kimapenzi bila kujiingiza katika ngono na mtu mwengine. Pia hofu ya kuambukizwa magonjwa ya zinaa, ikiwemo virusi vya HIV ni kichocheo tosha kinachopelekea baadhi ya watu kupiga punyeto. Lakini kuna sehemu wanaeleza hivi: Punyeto (kujitoa manii kwa mkono): “Punyeto” ni: Dhana inayowakilisha tendo la kujitoa/kushusha manii kwa njia isiyo jimai.