There is a science to this and I will share my perspective
A side chick has to be carefully selected. Especially if you love your woman and fear losing her. You cant be out here just smashing random thots. It's messy and can lead you all sorts of nastiness like STD's, pregnancies and being outed as a cheating piece of shyt.
The ideal side chick is a working woman who is focused on her career, and just needs some dikk and brief companionship to relieve stress. You can hit her up whenever, walk up in her spot like whatever and fukk her largely whenever you feel like it. This type of woman usually goes for emotionally unavailable men and is often a rebound chick. She may actually be a good woman with 1 major flaw that makes her unwifeable to most men. The older you get the more of these women become available to you. She may also give you the freedom to indulge in your various vices and be more accepting of your flaws then wifey. So you two may indulge in narcotics and other forms of degeneracy. This makes her an ideal side chick because as a reflection of your own flaws she can never be eligible to upgrade to wifey status. Wifey helps us be better men
The side chick relationship should be a like a relationship you have with a chick that your friends with and fukk. Maybe you do lunch from time to time or catch a flick together but fukking should be the backdrop to these interactions either before or after whatever brief and Cheap activity you engage in. If you aren't getting laid when yourE with your side chick she's moving you into the relationship bag and you are in danger. Get a new side chick.
If your side chick is alone on the holiday, sneak away from your family to pipe her maybe the day after the holiday if you can. The holidays are when men lose alot of their side chicks because she's at home lonely thinking about you with your main chick. Then again if she's trippin on you being with your woman on the holidays she's in the early or late stages of losing her mind by stepping out of her position . Get a new side chick
Get your side chick tested for STD's so you can fukk her raw or give her oral. For you losers that like to eat twat. Ideally you dont eat your side chick p*ssy ever.
Use code words when communicating by phone with your side chick. She should know when to call and when not to and safe language to use to avoid incriminating you. If you can get a 2nd phone do that.
Tell your side chick you have a girl because even if a woman is a slut that has told you she doesn't want a relationship her emotions may betray her if she's surprised by the revelation that she can't have you and may set a plot in motion to sabotage your real relationship.
If you are going to not tell your side piece you have a woman find a side chick with low self esteem, who is innocent or naive and wont do shyt but cry and be depressed if she finds out you have a woman. shyt she may even just succumb to her weakness and acceot being the other woman until her friends convince her to get a backbone. If you can get money out of her in the process do that.
Don't bring your side chick to your house for sex. This is why it's important to tell your side chick she is the side chick. Don't shyt where you eat. A suspicious woman that you live with will make sherlock homes look like a rookie cop. So fukk her at her house or a hotel and pay with cash using a fake name.
Good luck