If carried out within a monogamous relationship .. it's absolutely wonderful ..
Otherwise .. it's best avoided .. for obvious reasons ..
Before my Girlfriend & I slept together for the first time, we agreed that as we'd both had partners before .. we'd be HIV tested .. we can now enjoy our lovemaking with complete peace of mind ..
Besides which, a regular HIV test is no bad thing .. it's free in UK, takes about 15 minutes & could well save your life ... probably the most useful quarter of an hour you'll ever spend ..