How you use your own sexuality is your choice. How you use the sexuality of others is abuse.
Don't judge the actions of others that you don't understand. Rather observe, learn and decide what you want to apply in your life. You may want to change your mind later based on your own experience.
To read more about dealing with relationship issues:
I am in my late teens. A year ago I was at the airport with my mum, having just arrived from a long flight into this country. My dad was not with us, because he could not get a visa.
At the airport I used my mum’s phone to send a text, when a text came in for her. I opened her text and saw it was all about love, but not from my dad – from her college professor! I did not say anything but I was shocked. I thought that that was the end of it because he was still in our home country where my dad also was.
A few days later I heard her speak to him over the phone and realized he had also moved and was living close to me and my mum. I heard them arrange to meet, but she never said anything about it.
I know they are meeting regularly, and I know my dad knows nothing about this. Even if my dad does know, he cannot do anything because he still does not have a visa.
What shocks me most is that want my mum does is against our culture and religion, but it seems like she does not care.
I don’t know what to do about this.