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Let's just get this out of the way and make one thing very clear - 18+ are obsessed with sex. Completely, mind-bogglingly transfixed by the lustful act. I guess there's a reason that the duo, known simply as Sis and Bro (or Samia Mirza and Justin Swinburne), decided to aptly name their 'porno pop' project 18+, as this album most certainly isn't for the feint hearted or prudish amongst us. This is an album that strives to shock with its sexiness, but at times it bears an overwhelming air of style over substance.

18+ are a duo that depend very much on their image. It's been deliberately honed to make them the centre of attention, using stark videos to amplify that image across the internet and beyond. From playing galleries and being pulled in to perform for big names such as Prada, their music is linked to the aesthetics of their manipulated and mysterious art school duo image. It's all about darkness, sexuality and style, playing with an image that is as stripped back as it can be whilst still coming across as being something that is interesting and creative in its delivery.

There are moments when the whole formula comes together perfectly. Take the unapologetically sexual opening track 'All The Time', where Mirza purrs "put your paws on my draws" and "I can play all day with my eyes shut/ With you on my mind/ All the time." The sparse textures and the twirling melodies are atmospheric and bring a playfulness to the seductive nature of the song. It brings about a perfect backdrop to their dark R&B sound. Then there's the demented, drugged-up beats of 'Club God' that confront you with a hazy and somewhat harrowing viewpoint of a night out and show how easily the duo are able to create hard-hitting atmospherics through their stripped-back set-up.

And then there is 'Crow', which is without a doubt the album's crowning glory. The sampled crow that squawks throughout gives the song an utterly chilling gothic effect, whilst Swinburne's low drawl brings The xx to mind in every sense. It's not groundbreaking, and it sounds like things we have heard before, but it is a great demonstration of how their artistic vision can work in many ways.

However, there are moments when it all seems to lose its focus. Or perhaps it is because their focus is so niche that it begins to feel overplayed and saturated. 'Jets', 'Drawl' and 'Forgiven' all merge together in a nearly indistinguishable mixture, where the need to be sparse, sexy and appear artistic and stylish is more important than the actual music, which is never a good thing. Their aims and their focus on how they want their image to speaks louder than the music, and means it's like highlighting the brushstrokes on the canvas rather than the actual painting.

Fortunately, 'Almost Leaving' marks a moment where you get to catch your breath. Its tenderness is heartbreaking and believable. Its understated broken vocals are seeped in imperfections and wash over you with their remarkable honesty. It would have been interesting to see 18+ explore this element of their sound more extensively, but instead they go straight back into the sex with 'OIXU' with its outlandish and upfront attitude where the vocals get split back and forth between Mirza and Swinburne with mesmerising effect.

It's a lot easier to dip in and out of this album rather than to listen to it continuously, because by the end of it you feel exhausted - as though you've just gone through a long session with an overly-passionate partner. There are times when you would rather feel a bit more comfortable and have a bit of snuggle than have to go through the full works, because sometimes it's just too much to take in. 18+ should be commended on their unabashed attitude towards sex and gender, but they need to extend their subject matter and stop being so self-conscious. It is when they let go that their best work is able to work its magic.

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