ask your husband to do this. 

if you know what time she's coming, ask your husband to wait with you in front of your apartment door, start to do a really hot PDA, hugging, kissing, grab his penis or ask him to grab your ass, make sure she can see. when she walked pass, stop for a bit and you say hi to her. and ask him to ignore her. 

just make sure your son doesnt see what happened.