Not everyone wants to sleep with Voldemort. Some people like him because he's powerful, some people like him because he's evil. Some people like him because he's misunderstood, and some people just like him because he's their version of beauty (in short, he's hot to them).
Also, some people like him because they believe it's subversive or cool to do so.
Believe me, most people don't want to sleep with Voldemort.
Snape doesn't want or need to get the Philosophers Stone, he is one of the staff protecting it Professor Quirrell wants the stone for his master (Lord Voldemort) He is sharing his body with Lord Voldemort.
It was never about killing somebody, it was about stopping Lord Voldemort from killing more innocent people. Unfortunately, the only way to do that was to kill him. Harry wanted to stop Voldemort from hurting his friends, family and lots of innocents witches, wizards and muggles. Voldemort started a war, Harry ended it.
Lord Voldemort did want to kill Harry. He promised that he wouldn't because Harry had the philosopher's stone and Voldemort wasn't powerful enough to take it off him, but Voldemort was unlikely to actually keep that promise even if Harry had joined his side and handed the stone over.The only reason Voldemort didn't try to kill Harry is because he had no body, he was sharing Quirrell's but had no actual control over him.
He wanted to save the lives of others.
Most people want children. He loved Ginny, he is famous because he killed Lord Voldemort and he wants someone to pass down his honor and mischief at Hogwarts.
Tom Marvolo Riddle was a Slytherin Half-Blood who would later be known as Lord Voldemort. He didn't want to keep his muggle father's name (Riddle) (Muggle; non-magical person) so he fashioned a new name out of the letters in his birth name. Tom Marvolo Riddle is an anagram of I am Lord Voldemort.
Voldemort believed the Elder Wand would make him invincible.
Cedric Diggory was murdered using the Killing Curse (Avada Kedavra) by Peter Pettigrew on Lord Voldemort's order. Voldemort wanted to get to Harry and clearly, Diggory was in his way which is why Voldemort did away with him. Also, Lord Voldemort did not want anyone living to warn everyone that he had returned. Considering he planned on killing Potter, Voldemort did not think even he would live to warn anyone.
Severus Snape asked Lord Voldemort to spare Lily Potter because he loved Lily and didn't want her to die. Dumbledore was disgusted that he didn't care about James or Harry.
Because he wants to kill harry so he thinks he needs to have the "unbeatable" wand.
He realized that the stone was in his pocket because the mirror showed it, and he didn't want quill to know he had it.
Lord Voldemort didn't actually know or care who Cedric Diggory was. Cedric ended up in the graveyard by mistake and Voldemort didn't want to leave any loose ends, so ordered Wormtail to "kill the spare".