there is no read receipt feature...

curious how you know they opened it?

First, I want to know - how you know the messages were opened.  Am I missing a feature I don't know about?

If you haven't established some credibility on the boards, you might get ignored a lot.  It helps to post.  Of course, since you used an alias, I don't know what you have or have not done.

They either don't check out TER all the regularly or, they don't have PM as they may not be VIP.

It's unfortunate that TER does not give any way of knowing this when sending a PM.

Also, how do you tell if a PM was opened?

Start your PMs with:

"I am looking for some extra information.  I'll pay you $100 if you answer these questions..."

Alternatively, be appreciative for the review they've already written and shut up.  Other reviewers don't work for you.  If you're really so curious, just hire the girl already.

...and remember to pay her for her time.

I sent the message through the email feature..When the e-mail is read by the recipient it changes from bold letters to standard...The unread message remains in bold letters...Sorry if I caused any confusion.

It might be what u r asking in the e-mail.

Its good to know how u r able to check if some1 has opened his e-mail. I would like to know that feature and how to proceed.

Sometimes, the title of the message might not be appropriate. Sometimes, what is in the body might not be appropriate. For example, if u ask specific details that was redundant in the review, the person might chose to ignore it. If u ask something that was too personal, it might make the person uncomfortable. Either way, u may have to be careful of the types of questions u r asking to not throw the other person off.

The other comments were helpful also. But, if they don't reply, then screw them and c some1 else.

I got a fucking job. And to tell you the truth, PMs from ladies take a hell of a lot more precedence over some schlub looking for back channel info on some lady that had the pleasure of being with me.

Just fucking with you, man. I try to answer PMs from guys that ask about ladies I've seen. It might not be in the most timely manner, but I'll get around to it. Shit happens, and some things take priority.

For instance, a nice lady said she'd like to spend an inordinate amount of time with me tomorrow so I have to get my ass off this thing to get the house ready, do the grocery deal, and get properly drunk from now till then.

Have fun, and I hope you find what you're looking for!

1.  They don't know who you are, you have no posted reviews, so they won't respond.
2.  They don't give a shit.
3.  Their reviews are bogus, so they can't answer your questions.

I am more than happy to share info, but will only do so when I get PMs from members who actually have reviews and contribute to the community.   I also expect some reciprocity.

data.  They may feel it's too personal.  They do NOT know you.  They might not wish to reveal more info which might put the lady at risk...  outing, LE, etc.  There's no way to know who is PMing them.  
Some guys only hobby intermittantly...  vacations or business trips.  Finally, a lot of guys do not keep VIP all the time...  I only do when I'm shopping.  
skb

"everything contained here is fiction and is for your entertainment and amusement only"  

Perhaps the reviewers would not care to imply the review was anything but fiction by discussing it with someone they do not know?

We already are posting under made up names. Only the Admins of TER know our names and cities, unless we chose to give that information to others. When I get a PM asking for information, I check activity by the user, either post history or review history before replying to the PM. If the person posts under an alias and I can't attach the alias to the user that PMed me, I delete the PM and don't reply. I want to get a measure of the person that I may be giving information about a provider to, I don't want to send someone into a lady's presence who may be an insensitive jerk. No surprise, how people write say a lot about what they are as people.