Biopanda

No seriously, if he/she's serious about it, just tell him/her there's a risk of getting disease doing it. When you do it to someone you know it's more safe, but "how many dicks" let me think it's probably not only one known person ^^''

Hopefully the question is a trollish question (as i believe it is)

If you're only getting $50 you're not using Grindr right.

40+ year old men have expendable income and you should at least get dinner out of it too.