There is a massive draw back to sleeping bare within the jungle, and these “Bare and Afraid” contestants are experiencing it firsthand … ticks completely love genitals!!!

The painful lesson unfolds on the upcoming episode of Discovery’s “Bare And Afraid: Castaways” … when one castaway wakes as much as discover a handful of ticks connected to his penis!!!

Ya gotta see the video, obtained by TMZ … Andrew Shayde is simply waking up when he discovers the undesirable guests making camp on his dong … and he counts them off, one after the other.

Andrew’s clearly rattled … he says he is tremendous anxious about his “little castaway” and is freaking out.

For Andrew, it is the newest painful encounter with ticks … in a previous problem, the parasites bought in his butt crack.

Seems like fellow contestant Patrick French dodged a bullet … he says ticks embedded between his legs, however they prevented the “prime actual property.”