taking advantage 

A verb to describe when a person takes someone who is in extreme turmoil or not in their right state of mind and has sex with them even though they know that person wouldn't have sex with them otherwise.

He is taking advantage of that girl while she is drunk.

Example #2

Cindy is so mad at Ray right now, anybody could take advantage of her right now.

taking advantage by Leah1996 October 5, 2015

taking advantage of vulnerability 

When someone who has difficulty speaking for themselves, has a mental illness/disability or is under the influence of alcohol or drugs gets pushed to have sex or get their money manipulated out of them from a predator. It could also mean when a person is in turmoil and a predator targets their need for companionship to abuse, steal from or rape them.

Jamy is autistic and a guy manipulated her to have sex even if she didnt want to and was taking advantage of vulnerability.

taking advantage of vulnerability by Tingle Likes Rupees March 1, 2020