It’s possible to sin while saved, but it isn’t anywhere as easy as to sin before being saved. The Lord would generally be chastising them to show them the unprofitability of continuing to sin. Going into one of these “gay marriages” would be almost impossible, but that’s only IMHO.
Another point about sin before and after salvation is that before salvation we didn’t necessarily know it was sin. After salvation, even though we still sin, we now know that it is a sin and call it such.