I believe not, for that which invites sin is itself sinful.
I will attempt to paraphrase Paul of Tarsus here: “If something tempts you to sin, or if you see sin, run away - fast.”
Gay bars or gay dating sites - or for that matter, straight “singles” bars and straight dating sites - even if joined with the best of intentions, are a path to sin, for, to quote the Bible (Paul of Tarsus to the Romans), “For all men have sinned, and fall short of the glory of God”.
If that’s not immediately applicable, remember the road to sin is temptation, and the easily availability of illicit sex, alas, people who may very well practise it to such a degree as it becomes normal in their eyes, and may indeed attempt to force, or cajole, or tempt, others in to doing it, whether it be homosexual acts or heterosexual acts outside of marriage, are a sure temptation (unless one is a eunuch), and the wages of temptation is sin, and the wages of sin is death.
This principle is well-enshrined in Islamic legal tradition and fiqh (understanding), under the law, or principle, “That which leads to the haraam (forbidden) is itself haraam” and is enshrined in the New Covenant in Paul’s utterance as mentioned above. Do not stray towards sin: if one does not approach sin, and one turns his back to Satan, sin does not approach one, and can not touch one if you take refuge in God against it and the accursed Satan.
Stay upright and worship God, if out of wedlock, then in celibacy, and do not approach sin nor let it approach you; for sin is as a flame and the human soul is like a moth. For God is a loving God, all-merciful and all-forgiving, and he hates but one thing: sin (not sinners).
To quote a Hadith (saying or tradition) of the Prophet Muhammad (s.a.w.) which I believe is applicable to morality in all of the Abrahamic religions.
Ibn Abbas (r.a.) came to the Prophet Muhammad (s.a.w.) and said, “I have thoughts of such a nature that I would rather be burned to a crisp than to speak of them!” Muhammad (s.a.w.) said, "God is Great, God is Great, God is Great, Praise be to God, who has limited the matter to promptings of the mind."
(To scholars and scientists of Ahadith, if there are any present on a Catholic forum(!) I have not included the intermediary isnad; it is included in Abu Dawood, and is quoted from the Mishkat al-Masabih, translated in to the English language by le Gai Eaton, by way of the Mishkat al-Sunnah and is considered a sahih tradition.)