Am I putting myself in danger by a gang d?

No, you're being invited to participate in acts of prostitution. If you go, you won't be 'd', you'll be maybe 'robbed of service' by not being paid- but likely you'll get some cash and other goods, maybe a case of STD, but the inviters are not hiding their intentions so if you go you'll be doing consensual acts. That means no '' charges if you participate.