If you read the solo descriptions of the models at William Higgins, chances are the word straight is included in the 1st or 2nd sentence.
These are the current guys listed on page 1 under Updates at William Higgins.
- Karel Polak is a very cute 18 year old straight guy.
- Henrik Larson is a very handsome straight guy.
- Denis Menerov is a very hot straight guy aged 18.
- Ron Mark is a very hot straight guy, aged 20.
- Marek Chytry is aged 22. He is a very good looking straight guy who works as a salesman.
- Tono Milos was not identified as straight.
- Andrei Evans is a very cute straight guy aged 20.
- Petr Roland is aged 20. He is one very handsome and fit straight guy who works as a bartender.
Page 2 under Updates is no different.
- Andrej Sebesta is aged 20. He is a very handsome straight guy who likes sports, boxing and soccer.
- What a very sexy guy Aron Ros is. This straight stud came in for a massage.
- Martin Rezac is aged 21. He is a very handsome straight guy who is currently unemployed.
- Aron Ros is a very hot straight 22 year old.
- Bradley Cook is aged 18. He is one very handsome straight guy indeed.
- Anton Stanek was not identified as straight.
If the word straight was not included in the solo description, I guess the model is either bi or gay.