There are girls trying to chat with me on my email and i am not interested and do not want this!
Remove them from your contact list.
And, Microsoft suggests:
Read here: http://www.justanswer.com/computer/58cg0-hotmail-account-sending-porn-junk-emails-it-s.html
I'm not familiar with an efficient way, but on my hotmail I try create rules to automatically delete those emails.