I'm straight and used condoms for intercourse with every single woman I've been when things became sexual.
In hookup type situations, condoms were always used and always expected, by both of us.
In one long-term relationship, I continued to use condoms every time as she was not on birth control.
Only in another long term relationship did condoms eventually become unnecessary as it was a committed strictly monogamous relationship.
There are sooo many STDs/STIs out there, play safe!