Yes, exactly. I don’t accept the argument that they’re "not virgins" just because of how their first sex scenes look. I mean, toys exist, you know. Like you said, Nova was also wild during her first time, yet she was confirmed to be a virgin.A few weeks, IIRC, was the time she stated. Some of her lines at Warthogs suggest some experience on her part, but I'd bet (though not at very high stakes) "virgin" for Penny.
What makes me lean toward "not" for Alex is this (and a few of her following lines):
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It just suggests more experience with men generally than would otherwise be expected of her character. Conclusive? Certainly not. But IMO it leans that direction.
Their respective first penetration scenes don't move the needle one micron for me--yes, they're both wild, but so is Nova's, and we know she was a virgin beforehand.
The same thing applies to Dalia — she was very bold too. So, for me, it’s not a solid indicator.
Personally, I’d say it’s a 55/45 for Alex (leaning slightly towards her being a virgin), and 80/20 for Penny (much more likely still a virgin).