совокупляться(In English, the expression dates back to at least William Shakespeare's Othello (Act 1, Scene 1, ll. 126-127): I am one, sir, that comes to tell you your daughter and the Moor are now making the beast with two backs. VLZ_58)
облегчиться(= defecate: Langley (News 1130) – "A woman has been arrested after she was caught on video apparently taking a ‘number two' on the floor of a Tim Hortons in Langley. She's seen defecating in front of the counter following some sort of verbal confrontation with staff. Surveillance video of what happened, posted to the internet, then shows her throwing the feces at Tim Hortons workers before running out of frame."ART Vancouver)