chiefly with reference to people( sexual activity), including specifically sexual intercourse or copulation. it happens between , either of the two main categories male and female.

None can take your place.

None can understand girls.

mujhe yah samajh me nahi aaya Hai I haven't understood it hum ko yah samajh me nahi aaya Hai it has not been understood. OR it has not been understood by us here "hum ko" is in objective case.

I haven't understood your first answer.