Perhaps the wife has some sort of non - traditional view on relationships. She might be part of a community or have friends who engage in such practices and she is influenced by them. She may not fully understand the implications this can have on their marriage, such as jealousy, emotional turmoil, and damage to the trust they have built over time.
One possible reason could be that the wife is trying to spice up their relationship in a very unconventional way. Maybe she thinks it will add some excitement to their sex life.
In some cases, it could be due to new influences in her life. For example, if she enters a new social circle where there are bad examples or peer pressure. Maybe she starts hanging out with people who have loose morals and gets influenced by them. Also, personal insecurities can play a role. If she has low self - esteem, she might use sexual attention from others as a way to feel better about herself.
Society would generally view this situation very negatively. Most traditional values in society uphold monogamy and the idea of a marriage being between two people. This sort of behavior goes against those norms.
Maybe the wife brings home a new piece of lingerie that she surprises her husband with. She could have planned a special evening at home with candles, soft music, and a delicious dinner, and then reveal the lingerie as a prelude to a very intimate night.
He might be very surprised and excited. After all, it's something new that his wife has brought home.
One possible plot could be that the wife has been secretly learning to bake and surprises her husband with a delicious creampie. She presents it to him with a big smile, and they enjoy it together while sharing stories of their day.
Maybe the wife wants her husband to gain some knowledge or experience from the conference. For example, if it's a business conference, she might think it could help his career development.
One possible plot could be that the wife who works at home starts to feel neglected by her husband who is always out at work. So, she begins to form improper relationships with people she meets online while doing her work from home. But then she realizes the error of her ways when her husband discovers something amiss and she has to fight to save her marriage.
One possible plot could be that the wife has made some mistakes in the relationship, like being overly flirtatious with other men. She finally decides to tell her husband. She might be feeling guilty and wants to come clean in order to save their marriage.
Maybe the female stranger is in trouble and needs help. The husband is kind - hearted and wants to offer assistance, so he brings her home.
It could be that she has invited a female colleague over for a project they are working on together. Or perhaps it's a friend who needs a place to stay for a short while and your wife is being kind.