<human>: In January I separated from my wife after 10 years of marriage, we've got 6 year old twins and they now live half the time with her, half with me. 

She's recently got into hooking up with guys via app based social networks (Blendr I think), she's not interested in a relationship but just wants to have fun and sex. Usually she'll have the guys come over to her place when I've got the kids. When she first started doing this, a month ago, she confided to me that she was concerned about her safety, I suggested she consider using a different location than her home because it also exposes the kids to any risk, but she went ahead and met guys at her home anyway.

Last night she told me she currently has 4 guys on the go, one came over the night before and she had sex with him whilst another was hiding in the garden watching through the window. Just to be clear the kids are with me whilst this is all happening (as far as I'm aware).  

Now for me it's a bit challenging to hear all this because of my history with her: it's still relatively recently that we separated, we rarely had sex and she never orgasmed. So it's clear she's now exploring her sexuality and enjoying her freedom, which she has every right to.

When she tells me about this stuff I just get floored by it, full of my own feelings. She's telling me all this and kind of asking "is this OK?".

So should I be concerned about her and the kids safety? What advice can I give her? 
I'm thinking the biggest risk is that one of these guys turns up uninvited and won't leave. Luckily she lives on a street with a lot of good people she could call on for help.

One idea I've had is to send her [this article] which talks about responding to threats of violence.

Can you condense the text into a few key points?
<bot>: Ex is regularly fucking random guys in my kids home and starting to get more adventurous, should I be concerned for the safety of the kids & what advice can I give her?