Where does Riva want Shmulek to sleep? Why?

Riva wants Shmulek to sleep at her friend Henry's house. He is twenty, I think, and good looking. Riva is a sixteen year old girl. She doesnt like the optics of it and people may talk.

She tells him that he can sleep next door with Henry.

Quote-

"It may sound very silly to you, but I still care what people will say. You are a young man of twenty; I, a young lady of sixteen. They will gossip. Do you understand? I hope you do.”